| Extension |
File Description |
|
Popularity |
| .adr | Opera Bookmarks File | | Average |
| .ap | Active Page | | Average |
| .aro | SteelArrow Web Application File | | Average |
| .asa | ASP Configuration File | | Average |
| .ascx | Active Server Custom Control | | Average |
| .ashx | ASP.NET Web Handler File | | Average |
| .asmx | Active Server Method File | | Common |
| .asp | Active Server Page | | Very Common |
| .aspx | Active Server Page Extended | | Average |
| .asr | ActionScript Remote Document | | Average |
| .atom | Atom Syndication Format | | Average |
| .bml | Bean Markup Language File | | Average |
| .bok | ProStores Dynamic Web Page | | Average |
| .cdf | Channel Definition Format | | Rare |
| .cer | Internet Security Certificate | | Average |
| .cfm | ColdFusion Markup File | | Average |
| .cha | Online Chat Configuration File | | Average |
| .chat | Online Chat Configuration File | | Average |
| .chm | Compiled HTML Help File | | Average |
| .cms | Content Management System | | Average |
| .con | Concept Application Source File | | Average |
| .crt | Security Certificate | | Common |
| .csp | Concept Server Page | | Average |
| .css | Cascading Style Sheet | | Very Common |
| .dap | Access Data Access Page | | Average |
| .dbm | ColdFusion Server File | | Average |
| .dcr | Shockwave Media File | | Average |
| .dhtml | Dynamic HTML file | | Average |
| .disco | DISCO Discovery Document | | Average |
| .discomap | DISCO Discovery Output File | | Average |
| .dll | DLL Dynamic Web Page | | Average |
| .do | Java Servlet | | Average |
| .download | Partially Downloaded File | | Average |
| .dwt | Dreamweaver Web Page Template | | Average |
| .ece | Escenic Dynamic Web Page | | Uncommon |
| .epibrw | Web File Location | | Average |
| .esproj | Espresso Project File | | Average |
| .fmp | 123 Flash Menu Project | | Average |
| .gne | Flickr Web Page | | Average |
| .hdm | HDML File | | Rare |
| .hdml | Handheld Device Markup Language File | | Uncommon |
| .htaccess | Apache HTACCESS File | | Average |
| .htm | Hypertext Markup Language File | | Very Common |
| .html | Hypertext Markup Language File | | Very Common |
| .htx | HTML Extension File | | Average |
| .hxs | Help 2 Compiled Help File | | Average |
| .idc | Internet Database Connector File | | Average |
| .iqy | Internet Query | | Average |
| .jcz | Liquid Motion Animation | | Uncommon |
| .jhtml | Java HTML Web Page | | Average |
| .jnlp | Java Web Start File | | Average |
| .js | JavaScript File | | Very Common |
| .jsp | Java Server Page | | Very Common |
| .jspa | Java Servlet Alias | | Uncommon |
| .jspx | XML Java Server Page | | Common |
| .jvs | JavaScript Proxy Autoconfig File | | Average |
| .jws | Java Web Services File | | Average |
| .lasso | Lasso Database-Driven Web Page | | Average |
| .lbc | Cloaked Affiliate Link Builder Saved Link | | Average |
| .map | Image Map | | Uncommon |
| .master | ASP.NET Master Page | | Uncommon |
| .mht | MHTML Web Archive | | Average |
| .mhtml | MIME HTML File | | Average |
| .moz | Mozilla Cache File | | Average |
| .mspx | Microsoft ASP.NET Web Page | | Average |
| .nxg | eSite Builder NXG Web Page | | Uncommon |
| .ognc | Dynamic Web Page | | Average |
| .oth | OpenDocument HTML Template | | Average |
| .p12 | Personal Information Exchange | | Average |
| .pem | Privacy Enhanced Mail Certificate | | Average |
| .php | Hypertext Preprocessor File | | Very Common |
| .php3 | PHP 3 Web Page | | Uncommon |
| .php4 | PHP 4 Web Page | | Rare |
| .php5 | PHP 5 Web Page | | Rare |
| .phtm | PHP-Based Web Page | | Rare |
| .phtml | PHP Web Page | | Rare |
| .psp | PL/SQL Server Page | | Average |
| .qf | Qompose Web Page Template | | Average |
| .qrm | Qworum Message File | | Average |
| .rhtml | Ruby HTML Web Page | | Average |
| .rjs | Ruby Javascript File | | Average |
| .rss | Rich Site Summary | | Very Common |
| .rw3 | RapidWeaver 3 Site File | | Uncommon |
| .rwp | RapidWeaver Package | | Average |
| .rwsw | RapidWeaver Site File | | Average |
| .saveddeck | Nokia Saved Web Page | | Average |
| .sdb | SocialDecks Blog File | | Uncommon |
| .sht | HTML File with Server Side Includes | | Uncommon |
| .shtm | HTML Server Side Include File | | Average |
| .shtml | Server Side Include HTML File | | Average |
| .site | GoLive Website Project File | | Average |
| .srf | Server Response File | | Average |
| .stl | Certificate Trust List | | Rare |
| .stm | SSI Web Page | | Uncommon |
| .stml | SSI HTML File | | Rare |
| .stp | SharePoint Template | | Uncommon |
| .svc | IIS Special Content File | | Uncommon |
| .svr | Compressed Virtual World | | Average |
| .url | Internet Shortcut | | Average |
| .vbd | Visual Basic ActiveX Document | | Average |
| .vlp | LiveSite Project | | Rare |
| .vrml | VRML File | | Average |
| .vsdisco | DISCO Dynamic Discovery Document | | Average |
| .wdgt | Opera Widget | | Average |
| .webarchive | Safari Web Archive | | Common |
| .webloc | Mac OS X Website Location | | Average |
| .whtt | HTTrack Website Copier File | | Average |
| .wml | Wireless Markup Language File | | Common |
| .woa | WebObjects Application | | Average |
| .wpp | Serif WebPlus Project | | Average |
| .wrf | WebEx Recording | | Average |
| .wsdl | Web Services Description Language File | | Average |
| .xht | XHTML File | | Average |
| .xhtml | Extensible Hypertext Markup Language File | | Very Common |
| .xpd | XML Pipeline Document | | Average |
| .xul | XML User Interface Language File | | Average |
| .zfo | XSL-FO Online Form | | Average |
| .zhtml | Secure IE Zipped HTML File | | Average |
| .zvz | Possible Virus File | | Average |
