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<button class="jumpnavtoggle"> <span class="visuallyhidden">Page Contents Menu</span> <svg height="18" viewBox="0 0 32 32" width="18" xmlns="http://www.w3.org/2000/svg"><path clip-rule="evenodd" d="m4.93934 10.9393c.58579-.5857 1.53553-.5857 2.12132 0l8.93934 8.9394 8.9393-8.9394c.5858-.5857 1.5356-.5857 2.1214 0 .5857.5858.5857 1.5356 0 2.1214l-10 10c-.5858.5857-1.5356.5857-2.1214 0l-9.99996-10c-.58579-.5858-.58579-1.5356 0-2.1214z" fill="rgb(0,0,0)" fill-rule="evenodd"/></svg></button> </div> <ol class="many"><li class="ftypenav open"><a href="#autoconf_script_overview" class="ftype active"><span class="typenum">1.</span> Autoconf Script</a><ul class="subnav"><li><a href="#autoconf_script_moreinfo">More Information</a></li><li><a href="#autoconf_script_apps">Program List</a></li></ul><li class="ftypenav"><a href="#ac3d_3d_definition_file_overview" class="ftype"><span class="typenum">2.</span> AC3D 3D Definition File</a><ul class="subnav"><li><a href="#ac3d_3d_definition_file_moreinfo">More Information</a></li><li><a href="#ac3d_3d_definition_file_apps">Program List</a></li></ul><li class="ftypenav"><a href="#ancestral_quest_collaborative_database_file_overview" class="ftype"><span class="typenum">3.</span> Ancestral Quest Collaborative Database File</a><ul class="subnav"><li><a href="#ancestral_quest_collaborative_database_file_moreinfo">More Information</a></li><li><a href="#ancestral_quest_collaborative_database_file_open">How to Open</a></li><li><a href="#ancestral_quest_collaborative_database_file_apps">Program List</a></li></ul></ol></nav> <article> <div class="extTop"><header class="extHeader card"><h1><span class="fext">.AC</span> File Extension</h1><div class="multi closed"> <span class="multitop"><a href="" class="drawerToggle"><span> <svg width="16" height="16" viewBox="0 0 9 14" xmlns="http://www.w3.org/2000/svg"><path d="m0 14 9-7-9-7z"/></svg></span>3 file types</a> use the <strong>.ac</strong> file extension.</span> <ul> <li><span class='typeno'>1.</span><a href="#autoconf_script">Autoconf Script</a></li> <li><span class='typeno'>2.</span><a href="#ac3d_3d_definition_file">AC3D 3D Definition File</a></li> <li><span class='typeno'>3.</span><a href="#ancestral_quest_collaborative_database_file">Ancestral Quest Collaborative Database File</a></li> </ul> </div> </header> <section id="autoconf_script" class="filetype card hasfooter" data-termid="2104"> <div id="autoconf_script_overview"> <div class="entryHeader"> <div class="entryIcon" data-bg="https://fileinfo.com/img/icons/files/128/default.png" data-bg-lg="https://fileinfo.com/img/icons/files/256/default.png" title="Document Icon"></div> <h2 class="title">Autoconf Script</h2> <table class="headerInfo"> <tr> <td>Developer</td> <td>N/A</td> </tr> <tr> <td>Popularity</td> <td> <div class="popularity"> <span class="rtg four"></span><span class="stats"><span class="voteavg">4.0</span>  |  <span class="votetotal">104</span> <span class="votes">Votes</span></span></div></td> </tr> <tr> <td class="quickapp_label" data-label="Open with"> </td> <td class="quickapp_link"></td> </tr> </table> </div> <h3 id="autoconf_script_info" class="heading">What is an AC file?</h3> <div class="infoBox"> <p>Automatic configuration script produced by GNU Autoconf; automatically configures software <a href="https://techterms.com/definition/source_code" target="techterms">source code</a> packages to adapt to several types of Posix-like systems; created by testing a software package for each feature the program might need in order to run a specific system; Autoconf then builds a list of system features that the package requires.</p> </div> </div> <section id="autoconf_script_moreinfo"><h3 class="heading">More Information</h3> <div class="infoBox"> <p>Autoconf scripts are typically named "<b>configure.ac</b>." The automatic configuration script is created by running the preprocessor program <b>m4</b> with the configure.ac file as input.</p> </div> </section> <div class="adBotLB native"> <div id="div-gpt-ad-1695406251416-0"> </div> </div> <a href="/software/windows_file_viewer?ref=2104&b=1" class="promo" data-promo="fvp" data-ref="2104" data-ext="AC"><span class="promotext">Open over 400 file formats with <span class="promotitle">File Viewer Plus</span>.</span><span class="promoaction">Free Download</span></a> <section id="autoconf_script_apps"> <div class="programsheading"> <h3 class="programsquestion">Programs that open AC files</h3> <div class="programsmenu"> <button class="sort">Sort</button> <div class="sortmenu"> <div class="sortoptions"> <button class="psort" data-sort="license">Pricing</button> <button class="psort" data-sort="program">Program Name</button> <button class="psort" data-sort="platform">Platform</button> </div> <button class="sort-reset">Reset</button> </div> <button class="licenseheading" aria-label="pricing details"></button> <div class="licenseinfo"> <div class="licenseinfox"><button aria-label="close" style="outline: none;">X</button></div> </div> </div> </div> <div class="programsBox infoBox"> <div class="programs" data-plat="lin"> <div class="platformwrapper"> <div class="platform"><div class="platIcon" data-bg="https://fileinfo.com/img/os/linux.png" data-bg-lg="https://fileinfo.com/img/os/linux2x.png"></div>Linux</div> <div class="apps"> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/default.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/default.png"></div><div class="appmid"><div class="program"><span class="hlink">GNU Autoconf (requires GNU M4)</span></div><span class="license"></span></div></div> </div> </div> </div> </div> </section> <div class="adBotLB"> <div id="div-gpt-ad-1589912704162-0"> </div> </div> <footer class="ftfooter"><span>Category: <a href="/filetypes/executable">Executable Files</a></span><div class="upDate">Updated: April 5, 2007</div></footer></section> </div> <section id="ac3d_3d_definition_file" class="filetype card hasfooter" data-termid="10093"> <div id="ac3d_3d_definition_file_overview"> <div class="entryHeader"> <div class="entryIcon" data-bg="https://fileinfo.com/img/icons/files/128/default.png" data-bg-lg="https://fileinfo.com/img/icons/files/256/default.png" title="Document Icon"></div> <h2 class="title">AC3D 3D Definition File</h2> <table class="headerInfo"> <tr> <td>Developer</td> <td>Inivis</td> </tr> <tr> <td>Popularity</td> <td> <div class="popularity"> <span class="rtg two-half"></span><span class="stats"><span class="voteavg">2.3</span>  |  <span class="votetotal">6</span> <span class="votes">Votes</span></span></div></td> </tr> <tr> <td class="quickapp_label" data-label="Open with"> </td> <td class="quickapp_link"></td> </tr> </table> </div> <div id="ac3d_3d_definition_file_info" class="infoBox"> <p>An AC file contains information about the appearance of a a 3D model in AC3D format. It stores various appearance information, such as meshes, texture paths, UV-mappings, and material definitions. AC files are typically created by AC3D, an application used to create 3D models for games, flight simulation, and virtual reality.</p> </div> </div> <section id="ac3d_3d_definition_file_moreinfo"><h3 class="heading">More Information</h3> <div class="infoBox"> <p>While AC3D is a popular program foo creating AC files, the files are most commonly used by the X-Plane and FlightGear simulators. AC files can even be used to create X-Plane <a href="/extension/obj">.OBJ</a> files in AC3D and using the X-Plane plugin to export to the X-Plane OBJ format.</p> <p>Since AC files are saved in plain text, you can open and modify them using a text editor. To open an AC file with a text editor, you may need to change the <span class="filename">.ac</span> file extension to <span class="filename">.txt</span>. After viewing or saving changes to the file, change the file extension back to <span class="filename">.ac</span>.</p> <p><b>NOTE:</b> AC files used by FlightGear are often accompanied by an <a href="/extension/xml">.XML</a> file, which contains information that animates the object or scenery in the game.</p> </div> </section> <section id="ac3d_3d_definition_file_apps"> <div class="programsheading"> <h3 class="programsquestion">Programs that open AC files</h3> <div class="programsmenu"> <button class="sort">Sort</button> <div class="sortmenu"> <div class="sortoptions"> <button class="psort" data-sort="license">Pricing</button> <button class="psort" data-sort="program">Program Name</button> <button class="psort" data-sort="platform">Platform</button> </div> <button class="sort-reset">Reset</button> </div> <button class="licenseheading" aria-label="pricing details"></button> <div class="licenseinfo"> <div class="licenseinfox"><button aria-label="close" style="outline: none;">X</button></div> </div> </div> </div> <div class="programsBox infoBox"> <div class="programs" data-plat="win"> <div class="platformwrapper"> <div class="platform"><div class="platIcon" data-bg="https://fileinfo.com/img/os/windows.png" data-bg-lg="https://fileinfo.com/img/os/windows2x.png"></div>Windows</div> <div class="apps"> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/inivis_ac3d.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/inivis_ac3d.png"></div><div class="appmid"><div class="program"><a href="http://www.inivis.com/" target="_blank" rel="nofollow noopener">Inivis AC3D</a><span class="external"></span></div><span class="license trial">Free Trial</span></div></div> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/blender.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/blender.png"></div><div class="appmid"><div class="program"><a href="/software/blender/blender">Blender</a></div><span class="license free">Free</span></div></div> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/x-plane.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/x-plane.png"></div><div class="appmid"><div class="program"><a href="/software/x-plane/x-plane">X-Plane</a></div><span class="license paid">Paid</span></div></div> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/flightgear.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/flightgear.png"></div><div class="appmid"><div class="program"><a href="https://www.flightgear.org/" target="_blank" rel="nofollow noopener">FlightGear</a><span class="external"></span></div><span class="license free">Free</span></div></div> </div> </div> </div> <div class="programs" data-plat="mac"> <div class="platformwrapper"> <div class="platform"><div class="platIcon" data-bg="https://fileinfo.com/img/os/mac.png" data-bg-lg="https://fileinfo.com/img/os/mac2x.png"></div>Mac</div> <div class="apps"> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/inivis_ac3d.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/inivis_ac3d.png"></div><div class="appmid"><div class="program"><a href="http://www.inivis.com/" target="_blank" rel="nofollow noopener">Inivis AC3D</a><span class="external"></span></div><span class="license trial">Free Trial</span></div></div> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/blender.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/blender.png"></div><div class="appmid"><div class="program"><a href="/software/blender/blender">Blender</a></div><span class="license free">Free</span></div></div> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/x-plane.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/x-plane.png"></div><div class="appmid"><div class="program"><a href="/software/x-plane/x-plane">X-Plane</a></div><span class="license paid">Paid</span></div></div> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/flightgear.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/flightgear.png"></div><div class="appmid"><div class="program"><a href="https://www.flightgear.org/" target="_blank" rel="nofollow noopener">FlightGear</a><span class="external"></span></div><span class="license free">Free</span></div></div> </div> </div> </div> <div class="programs" data-plat="lin"> <div class="platformwrapper"> <div class="platform"><div class="platIcon" data-bg="https://fileinfo.com/img/os/linux.png" data-bg-lg="https://fileinfo.com/img/os/linux2x.png"></div>Linux</div> <div class="apps"> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/inivis_ac3d.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/inivis_ac3d.png"></div><div class="appmid"><div class="program"><a href="http://www.inivis.com/" target="_blank" rel="nofollow noopener">Inivis AC3D</a><span class="external"></span></div><span class="license trial">Free Trial</span></div></div> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/blender.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/blender.png"></div><div class="appmid"><div class="program"><a href="/software/blender/blender">Blender</a></div><span class="license free">Free</span></div></div> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/x-plane.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/x-plane.png"></div><div class="appmid"><div class="program"><a href="/software/x-plane/x-plane">X-Plane</a></div><span class="license paid">Paid</span></div></div> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/flightgear.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/flightgear.png"></div><div class="appmid"><div class="program"><a href="https://www.flightgear.org/" target="_blank" rel="nofollow noopener">FlightGear</a><span class="external"></span></div><span class="license free">Free</span></div></div> </div> </div> </div> </div> </section> <footer class="ftfooter"><span>Category: <a href="/filetypes/game">Game Files</a></span><div class="upDate">Updated: February 6, 2019</div></footer></section> <section id="ancestral_quest_collaborative_database_file" class="filetype card hasfooter" data-termid="11804"> <div id="ancestral_quest_collaborative_database_file_overview"> <div class="entryHeader"> <div class="entryIcon" data-bg="https://fileinfo.com/img/icons/files/128/ac-11804.png" data-bg-lg="https://fileinfo.com/img/icons/files/256/ac-11804.png" title="Incline Software Ancestral Quest 16 Icon"></div> <h2 class="title">Ancestral Quest Collaborative Database File</h2> <table class="headerInfo"> <tr> <td>Developer</td> <td>Incline Software</td> </tr> <tr> <td>Popularity</td> <td> <div class="popularity"> <span class="rtg three-half"></span><span class="stats"><span class="voteavg">3.5</span>  |  <span class="votetotal">2</span> <span class="votes">Votes</span></span></div></td> </tr> <tr> <td class="quickapp_label" data-label="Open with"> </td> <td class="quickapp_link"></td> </tr> </table> </div> <div id="ancestral_quest_collaborative_database_file_info" class="infoBox"> <p>An AC file may also be a database file created by Incline Software Ancestral Quest, a family tree genealogy application. It contains information about a family tree, which includes the names, birthplaces, and descriptions of family members and their relationships with each other. AC files are similar to Ancestral Quest <a href="/extension/aq">.AQ</a> database files but also store admin and user rights for verifying which users can collaborate on the database.</p> </div> </div> <section id="ancestral_quest_collaborative_database_file_moreinfo"><h3 class="heading">More Information</h3> <div class="infoBox"> <p>Ancestral Quest is a commercial family tree application that enables you to record, organize, and visualize your family's genealogical information. It also provides a collaboration feature that allows multiple family members to take turns editing the same file (AC file).</p> <p>To create an AC file with Ancestral Quest, select <span class="menu">Collaborate → New File...</span>. You can convert a local AQ file to an AC file for collaboration by selecting <span class="menu">Collaboarate → Publish Current File...</span>. You can also convert an AC file to a local AQ file by selecting <span class="menu">Collaboarate → Convert to Local...</span>.</p> </div> </section> <section id="ancestral_quest_collaborative_database_file_open"> <h3 class="heading">How to open an AC file</h3> <div class="infoBox"> <p>You can only open AC files with Ancestral Quest. To open an AC file with the software, select <span class="menu">File → Open...</span> or select <span class="menu">Collaborate → Open Published File...</span>.</p> </div> </section> <section id="ancestral_quest_collaborative_database_file_apps"> <div class="programsheading"> <h3 class="programsquestion">Programs that open AC files</h3> <div class="programsmenu"> <button class="sort">Sort</button> <div class="sortmenu"> <div class="sortoptions"> <button class="psort" data-sort="license">Pricing</button> <button class="psort" data-sort="program">Program Name</button> <button class="psort" data-sort="platform">Platform</button> </div> <button class="sort-reset">Reset</button> </div> <button class="licenseheading" aria-label="pricing details"></button> <div class="licenseinfo"> <div class="licenseinfox"><button aria-label="close" style="outline: none;">X</button></div> </div> </div> </div> <div class="programsBox infoBox"> <div class="programs" data-plat="win"> <div class="platformwrapper"> <div class="platform"><div class="platIcon" data-bg="https://fileinfo.com/img/os/windows.png" data-bg-lg="https://fileinfo.com/img/os/windows2x.png"></div>Windows</div> <div class="apps"> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/incline_software_ancestral_quest.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/incline_software_ancestral_quest.png"></div><div class="appmid"><div class="program"><a href="https://www.ancquest.com/index.htm" target="_blank" rel="nofollow noopener">Incline Software Ancestral Quest</a><span class="external"></span></div><span class="license paid">Paid</span></div></div> </div> </div> </div> <div class="programs" data-plat="mac"> <div class="platformwrapper"> <div class="platform"><div class="platIcon" data-bg="https://fileinfo.com/img/os/mac.png" data-bg-lg="https://fileinfo.com/img/os/mac2x.png"></div>Mac</div> <div class="apps"> <div class="app"><div class="appIcon" data-bg="https://fileinfo.com/img/icons/apps/32/incline_software_ancestral_quest.png" data-bg-lg="https://fileinfo.com/img/icons/apps/64/incline_software_ancestral_quest.png"></div><div class="appmid"><div class="program"><a href="https://www.ancquest.com/index.htm" target="_blank" rel="nofollow noopener">Incline Software Ancestral Quest</a><span class="external"></span></div><span class="license paid">Paid</span></div></div> </div> </div> </div> </div> </section> <div class="adBotLB"> <div id="div-gpt-ad-1589912857517-0"> </div> </div> <footer class="ftfooter"><span>Category: <a href="/filetypes/database">Database Files</a></span><div class="upDate">Updated: December 11, 2020</div></footer></section> </article> <div class="fileinfo card"> <h2 class="heading"><svg height="20" viewBox="0 0 20 20" width="20" xmlns="http://www.w3.org/2000/svg"><path d="m10 0c5.5228475 0 10 4.4771525 10 10s-4.4771525 10-10 10-10-4.4771525-10-10 4.4771525-10 10-10zm5.1507914 5.74076153c-.38707-.3317743-.9547571-.31591752-1.3224984.01829628l-.0875496.09016895-5.2977434 6.17879134-2.23589322-2.23510675-.09420734-.08318861c-.3922912-.30502489-.95952226-.27729535-1.32000622.08318861-.36048396.36048395-.3882135.92771505-.08318861 1.32000625l.08318861.0942073 3 3 .09209242.0815699c.382869.299536.92993804.278526 1.28870593-.0494925l.08556503-.0883928 6-7 .0757182-.10031012c.2740391-.41453005.2028866-.97796356-.1841834-1.30973785z" fill="#09aa51" fill-rule="evenodd"/></svg> Verified by FileInfo.com</h2> <p><a href="/help/authors">The FileInfo.com team</a> has independently researched all file formats and software programs listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.</p> <p>If you would like to suggest any additions or updates to this page, <a href="/contact?form=update&ext=ac">please let us know</a>.</p> </div> <div class="prevnext"> <a href="/extension/aby">‹ .ABY</a> <span> | </span> <a href="/extension/ac$">.AC$ ›</a> </div> </div> <div id="right"> <div id="fixedside"> <div class="pagenav"> <h2>PAGE CONTENTS</h2> <nav> <ol class="many"> <li class="ftypenav open"> <a href="#autoconf_script_overview" class="ftype active"><span class="typenum">1.</span> Autoconf Script</a> <ul class="subnav"> <li><a href="#autoconf_script_moreinfo">More Information</a></li> <li><a href="#autoconf_script_apps">Program List</a></li> </ul> </li> <li class="ftypenav"> <a href="#ac3d_3d_definition_file_overview" class="ftype"><span class="typenum">2.</span> AC3D 3D Definition File</a> <ul class="subnav"> <li><a href="#ac3d_3d_definition_file_moreinfo">More Information</a></li> <li><a href="#ac3d_3d_definition_file_apps">Program List</a></li> </ul> </li> <li class="ftypenav"> <a href="#ancestral_quest_collaborative_database_file_overview" class="ftype"><span class="typenum">3.</span> Ancestral Quest Collaborative Database File</a> <ul class="subnav"> <li><a href="#ancestral_quest_collaborative_database_file_moreinfo">More Information</a></li> <li><a href="#ancestral_quest_collaborative_database_file_open">How to Open</a></li> <li><a href="#ancestral_quest_collaborative_database_file_apps">Program List</a></li> </ul> </li> </ol> </nav> </div> <div class="adRightSky"> <div id="div-gpt-ad-1589922359625-0"> </div> </div> </div> </div> </div> <script> TYPE = "e"; extArr = new Array(); extArr[0] = 2104; extArr[1] = 10093; extArr[2] = 11804; formatInfo = [{"heading":"N\/A","detail":"File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined."},{"heading":"Text","detail":"This file is saved in a plain text format. You can open and view the contents of this file using a <a href=\"\/help\/text_editors\">text editor<\/a>."},{"heading":"N\/A","detail":"File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined."}] T="ac";C="302cc524b76c1f9c6d392d67de68a020"; </script> </main> <footer id="sitefooter"><a href="https://sharpened.com/" target="_blank" rel="noopener"><span class="copyright">© 2025 Sharpened Productions</span></a>  |  <a href="/terms">Terms of Use</a>  |  <a href="/privacy">Privacy Policy</a>  |  <button class="ot-sdk-show-settings">Cookie Settings</button>  |  <a href="/about">About</a>  |  <a href="/contact">Contact</a></footer> </div> <script defer src="https://fileinfo.com/js/fi.js?v=1"></script> <script async src="https://fundingchoicesmessages.google.com/i/pub-0087137714961591?ers=1" nonce="WQeQmShICpf9rYcBWE6D9w"></script><script nonce="WQeQmShICpf9rYcBWE6D9w">(function() {function signalGooglefcPresent() {if (!window.frames['googlefcPresent']) {if (document.body) {const iframe = document.createElement('iframe'); iframe.style = 'width: 0; height: 0; border: none; z-index: -1000; left: -1000px; top: -1000px;'; iframe.style.display = 'none'; iframe.name = 'googlefcPresent'; document.body.appendChild(iframe);} else {setTimeout(signalGooglefcPresent, 0);}}}signalGooglefcPresent();})();</script> <script defer src="https://fileinfo.com/js/fi-smoothscroll.js"></script></body> </html>