| Extension |
| File Description |
| .adr |
| Opera Bookmarks File |
| .aex |
| Alpha Five Compiled Global Functions File |
| .alx |
| ActiveX Layout Control File |
| .ap |
| Active Page |
| .aro |
| SteelArrow Web Application File |
| .asa |
| ASP Configuration File |
| .asax |
| ASP.NET Server Application File |
| .ascx |
| ASP.NET User Control File |
| .ashx |
| ASP.NET Web Handler File |
| .asmx |
| ASP.NET Web Service File |
| .asp |
| Active Server Page |
| .aspx |
| Active Server Page Extended File |
| .asr |
| ActionScript Remote Document |
| .atom |
| Atom Syndication Format |
| .att |
| Web Form Post Data File |
| .awm |
| AllWebMenus Project File |
| .axd |
| ASP.NET Web Handler File |
| .bml |
| Bean Markup Language File |
| .bok |
| ProStores Dynamic Web Page |
| .browser |
| ASP.NET Browser Definition File |
| .btapp |
| uTorrent App |
| .cdf |
| Channel Definition Format |
| .cer |
| Internet Security Certificate |
| .cfm |
| ColdFusion Markup File |
| .cfml |
| ColdFusion Markup Language File |
| .cha |
| Online Chat Configuration File |
| .chat |
| Online Chat Configuration File |
| .chm |
| Compiled HTML Help File |
| .cms |
| Content Management System |
| .con |
| Concept Application Source File |
| .crdownload |
| Chrome Partially Downloaded File |
| .crl |
| Certificate Revocation List File |
| .crt |
| Security Certificate |
| .csp |
| Concept Server Page |
| .csr |
| Certificate Signing Request File |
| .css |
| Cascading Style Sheet |
| .dap |
| Access Data Access Page |
| .dbm |
| ColdFusion Server File |
| .dcr |
| Shockwave Media File |
| .der |
| DER Certificate File |
| .dhtml |
| Dynamic HTML file |
| .disco |
| DISCO Discovery Document |
| .discomap |
| DISCO Discovery Output File |
| .dll |
| DLL Dynamic Web Page |
| .dml |
| DynaScript File |
| .do |
| Java Servlet |
| .dochtml |
| Microsoft Word HTML Document |
| .docmhtml |
| Microsoft Word MIME HTML Document |
| .dothtml |
| Microsoft Word HTML Document Template |
| .download |
| Partially Downloaded File |
| .dwt |
| Dreamweaver Web Page Template |
| .ece |
| Escenic Dynamic Web Page |
| .epibrw |
| Web File Location |
| .esproj |
| Espresso Project File |
| .ewp |
| Ewisoft Website Project File |
| .fmp |
| 123 Flash Menu Project |
| .gne |
| Flickr Web Page |
| .gsp |
| IMail Error Message File |
| .hdm |
| HDML File |
| .hdml |
| Handheld Device Markup Language File |
| .htaccess |
| Apache HTACCESS File |
| .htc |
| HTML Component File |
| .htm |
| Hypertext Markup Language File |
| .html |
| Hypertext Markup Language File |
| .htx |
| HTML Extension File |
| .hxs |
| Help 2 Compiled Help File |
| .idc |
| Internet Database Connector File |
| .iqy |
| Internet Query |
| .itms |
| iTunes Music Store Link File |
| .itpc |
| iTunes Podcast Link File |
| .iwdgt |
| iWeb Widget File |
| .jcz |
| Liquid Motion Animation |
| .jhtml |
| Java HTML Web Page |
| .jnlp |
| Java Web Start File |
| .js |
| JavaScript File |
| .jsp |
| Java Server Page |
| .jspa |
| Java Servlet Alias |
| .jspx |
| XML Java Server Page |
| .jst |
| JavaServer Page Document |
| .jvs |
| JavaScript Proxy Autoconfig File |
| .jws |
| Java Web Services File |
| .lasso |
| Lasso Database-Driven Web Page |
| .lbc |
| Cloaked Affiliate Link Builder Saved Link |
| .maff |
| Mozilla Archive Format File |
| .map |
| Image Map |
| .mapx |
| Mapjects Client Webparts File |
| .master |
| ASP.NET Master Page |
| .mht |
| MHTML Web Archive |
| .mhtml |
| MIME HTML File |
| .moz |
| Mozilla Cache File |
| .mspx |
| Microsoft ASP.NET Web Page |
| .mvc |
| MivaScript Compiled File |
| .mvr |
| IBM HotMedia Multimedia File |
| .nxg |
| eSite Builder NXG Web Page |
| .nzb |
| NewzBin Usenet Index File |
| .obml |
| Opera Mini Saved Web Page |
| .ognc |
| Dynamic Web Page |
| .opml |
| Outline Processor Markup Language File |
| .oth |
| OpenDocument HTML Template |
| .p12 |
| Personal Information Exchange |
| .p7 |
| PKCS #7 Digital Certificate File |
| .p7b |
| PKCS #7 Certificate File |
| .p7c |
| PKCS #7 Certificate File |
| .pac |
| Proxy Auto-Config File |
| .page |
| HybridJava Web Page |
| .pem |
| Privacy Enhanced Mail Certificate |
| .php |
| Hypertext Preprocessor File |
| .php3 |
| PHP 3 Web Page |
| .php4 |
| PHP 4 Web Page |
| .php5 |
| PHP 5 Web Page |
| .phtm |
| PHP-Based Web Page |
| .phtml |
| PHP Web Page |
| .ppthtml |
| PowerPoint HTML Presentation |
| .pptmhtml |
| Microsoft PowerPoint MIME HTML Presentation |
| .prf |
| PICS Rules File |
| .psp |
| PL/SQL Server Page |
| .ptw |
| AutoCAD Publish To Web File |
| .pub |
| Public Key File |
| .qbo |
| QuickBooks Online Bank Statement File |
| .qf |
| Qompose Web Page Template |
| .qrm |
| Qworum Message File |
| .rhtml |
| Ruby HTML Web Page |
| .rjs |
| Ruby Javascript File |
| .rss |
| Rich Site Summary |
| .rt |
| RealText Streaming Text File |
| .rw3 |
| RapidWeaver 3 Site File |
| .rwp |
| RapidWeaver Package |
| .rwsw |
| RapidWeaver Site File |
| .saveddeck |
| Nokia Saved Web Page |
| .sdb |
| SocialDecks Blog File |
| .seam |
| Seam Framework Java Servlet File |
| .sht |
| HTML File with Server Side Includes |
| .shtm |
| HTML Server Side Include File |
| .shtml |
| Server Side Include HTML File |
| .site |
| GoLive Website Project File |
| .sitemap |
| ASP.NET Site Map File |
| .sites2 |
| iWeb Site Design Project |
| .spc |
| Software Publisher Certificate File |
| .srf |
| Server Response File |
| .ssp |
| Scala Server Page |
| .stl |
| Certificate Trust List |
| .stm |
| SSI Web Page |
| .stml |
| SSI HTML File |
| .stp |
| SharePoint Template |
| .svc |
| WCF Web Service File |
| .svr |
| Compressed Virtual World |
| .swz |
| Adobe Flash Player Cache File |
| .tvpi |
| TitanTV Television Listing File |
| .tvvi |
| TitanTV Television Listing File |
| .ucf |
| WebEx Media File |
| .url |
| Internet Shortcut |
| .vbd |
| Visual Basic ActiveX Document |
| .vlp |
| LiveSite Project |
| .vrml |
| VRML File |
| .vsdisco |
| DISCO Dynamic Discovery Document |
| .wdgt |
| Opera Widget |
| .webarchive |
| Safari Web Archive |
| .webbookmark |
| Safari Web Bookmark File |
| .webhistory |
| Safari Web History File |
| .webloc |
| Mac OS X Website Location |
| .website |
| Internet Explorer Pinned Site Shortcut |
| .wgp |
| Web Gallery Project |
| .wgt |
| Opera Widget File |
| .whtt |
| HTTrack Website Copier File |
| .widget |
| HybridJava Widget |
| .wml |
| Wireless Markup Language File |
| .wn |
| WN Web File |
| .woa |
| WebObjects Application |
| .wpp |
| Serif WebPlus Project |
| .wrf |
| WebEx Recording |
| .wsdl |
| Web Services Description Language File |
| .xbl |
| Extensible Binding Language File |
| .xfdl |
| XFDL File |
| .xht |
| XHTML File |
| .xhtm |
| Extensible Hypertext Markup Language Document |
| .xhtml |
| Extensible Hypertext Markup Language File |
| .xpd |
| XML Pipeline Document |
| .xul |
| XML User Interface Language File |
| .xws |
| Xara Web Designer Graphic |
| .zfo |
| XSL-FO Online Form |
| .zhtml |
| Secure IE Zipped HTML File |
| .zul |
| ZK User Interface File |
| .zvz |
| Possible Virus File |
Source : http://www.fileinfo.com/
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