File extension	The full name of the file	Popularity
File extension A4P	A4Desk Pro Project File
File extension A5W	Alpha Five Webpage File
File extension ADR	Opera Bookmarks File
File extension AEX	Alpha Five Compiled Global Functions File
File extension ALX	ActiveX Layout Control File
File extension AN	Adobe Edge Animate Project File
File extension AP	Active Page
File extension ARO	SteelArrow Web Application File
File extension ASA	ASP Configuration File
File extension ASAX	ASP.NET application optional source file
File extension ASCX	ASP.NET User Control File
File extension ASHX	ASP.NET Web Handler file
File extension ASMX	ASP.NET Web Service File
File extension ASP	Active Server Page
File extension ASPX	Active Server Page Extended File
File extension ASR	ActionScript Remote Document
File extension ATOM	Atom web feed file
File extension ATT	Web Form Data file
File extension AWM	AllWebMenus Project File
File extension AXD	ASP.NET Web Handler File
File extension BML	Bean Markup Language File
File extension BOK	ProStores Dynamic Web Page
File extension BROWSER	ASP.NET Browser Definition File
File extension BTAPP	uTorrent App
File extension BWP	BuRg3r Web Page
File extension CDF	Channel Definition Format
File extension CER	Internet Security Certificate
File extension CFM	ColdFusion Markup File
File extension CFML	ColdFusion Markup Language File
File extension CHA	IRC Chat Configuration File
File extension CHAT	IRC Chat Configuration File
File extension CHM	Compiled HTML Help File
File extension CMS	Content Management System
File extension CODASITE	Coda Site File
File extension COMPRESSED	WordCompress Compacted Web File
File extension CPG	Cool Page Project File
File extension CRL	Certificate Revocation List File
File extension CRT	Security Certificate
File extension CSHTML	ASP.NET Razor Web Page
File extension CSP	Concept Server Page
File extension CSR	Certificate Signing Request File
File extension CSS	Cascading Style Sheet
File extension DAP	Download Accelerator partial download file
File extension DBM	ColdFusion Server File
File extension DCR	Shockwave Media File
File extension DER	DER Certificate File
File extension DHTML	Dynamic HTML file
File extension DISCO	DISCO Discovery Document
File extension DISCOMAP	DISCO Discovery Output File
File extension DLL	DLL Dynamic Web Page
File extension DML	DynaScript File
File extension DO	Java Servlet
File extension DOCHTML	Microsoft Word HTML Document
File extension DOCMHTML	Microsoft Word MIME HTML Document
File extension DOTHTML	Microsoft Word HTML Document Template
File extension DOWNLOAD	Partially Downloaded File
File extension DWT	Dreamweaver Web Page Template
File extension ECE	Escenic Dynamic Web Page
File extension EDGE	Adobe Edge Project File
File extension EPIBRW	Web File Location
File extension ESPROJ	Espresso Project File
File extension EWP	Ewisoft Website Project File
File extension FCGI	FastCGI File
File extension FMP	123 Flash Menu Project
File extension FWP	Microsoft Expression Web Package
File extension GNE	Flickr Web Page
File extension GSP	IMail Error Message File
File extension HDM	HDML File
File extension HDML	Handheld Device Markup Language File
File extension HTACCESS	Apache HTACCESS File
File extension HTC	HTML Component File
File extension HTM	Hypertext Markup Language File
File extension HTML	Hypertext Markup Language File
File extension HTX	HTML Extension File
File extension HXS	Help 2 Compiled Help File
File extension HYPE	Hype Document
File extension IDC	Internet Database Connector File
File extension IQY	Internet Query
File extension ITMS	iTunes Music Store Link File
File extension ITPC	iTunes Podcast Link File
File extension IWDGT	iWeb Widget File
File extension JCZ	Liquid Motion Animation
File extension JHTML	Java HTML Web Page
File extension JNLP	Java Web Start File
File extension JS	JavaScript File
File extension JSON	JavaScript Object Notation File
File extension JSP	Java Server Page
File extension JSPA	Java Servlet Alias
File extension JSPX	XML Java Server Page
File extension JSS	JavaScript Style Sheet File
File extension JST	JavaServer Page Document
File extension JVS	JavaScript Proxy Autoconfig File
File extension JWS	Java Web Services File
File extension LASSO	Lasso Database-Driven Web Page
File extension LBC	Cloaked Affiliate Link Builder Saved Link
File extension LESS	LESS Style Sheet
File extension MAFF	Mozilla Archive Format File
File extension MAP	Image Map
File extension MAPX	Mapjects Client Webparts File
File extension MASTER	ASP.NET Master Page
File extension MHT	MHTML Web Archive
File extension MHTML	MIME HTML File
File extension MOZ	Mozilla Cache File
File extension MSPX	Microsoft ASP.NET Web Page
File extension MUSE	Adobe Muse Website Project
File extension MVC	MivaScript Compiled File
File extension MVR	IBM HotMedia Multimedia File
File extension NOD	NetObjects Fusion File
File extension NXG	eSite Builder NXG Web Page
File extension NZB	NewzBin Usenet Index File
File extension OAM	Adobe Edge Animate Widget File
File extension OBML	Opera Mini Saved Web Page
File extension OGNC	Dynamic Web Page
File extension OPML	Outline Processor Markup Language File
File extension OTH	OpenDocument HTML Template
File extension P12	Personal Information Exchange File
File extension P7	PKCS #7 Digital Certificate File
File extension P7B	PKCS #7 Certificate File
File extension P7C	PKCS #7 Certificate File
File extension PAC	Proxy Auto-Config File
File extension PAGE	HybridJava Web Page
File extension PEM	Privacy Enhanced Mail Certificate
File extension PHP	PHP Source Code File
File extension PHP3	PHP 3 Web Page
File extension PHP4	PHP 4 Web Page
File extension PHP5	PHP 5 Web Page
File extension PHTM	PHP-Based Web Page
File extension PHTML	PHP Web Page
File extension PPTHTML	PowerPoint HTML Presentation
File extension PPTMHTML	Microsoft PowerPoint MIME HTML Presentation
File extension PRF	PICS Rules File
File extension PRO	Adobe Proto Design File
File extension PSP	PL/SQL Server Page
File extension PTW	AutoCAD Publish To Web File
File extension PUB	Public Key File
File extension QBO	QuickBooks Online Bank Statement File
File extension QF	Qompose Web Page Template
File extension QRM	Qworum Message File
File extension RHTML	Ruby HTML Web Page
File extension RJS	Ruby Javascript File
File extension RSS	Rich Site Summary
File extension RT	RealText Streaming Text File
File extension RW3	RapidWeaver 3 Site File
File extension RWP	RapidWeaver Package
File extension RWSW	RapidWeaver Site File
File extension RWTHEME	RapidWeaver Theme
File extension SAVEDDECK	Nokia Saved Web Page
File extension SDB	SocialDecks Blog File
File extension SEAM	Seam Framework Java Servlet File
File extension SHT	HTML File with Server Side Includes
File extension SHTM	HTML Server Side Include File
File extension SHTML	Server Side Include HTML File
File extension SITE	GoLive Website Project File
File extension SITEMAP	ASP.NET Site Map File
File extension SITES	iWeb Site Design Project
File extension SITES2	iWeb Site Design Project
File extension SPC	Software Publisher Certificate File
File extension SRF	Server Response File
File extension SSP	Scala Server Page
File extension STL	Certificate Trust List
File extension STM	HTML server side include file
File extension STML	SSI HTML File
File extension STP	SharePoint Template
File extension SUCK	SiteSucker Website File
File extension SVC	WCF Web Service File
File extension SVR	Compressed Virtual World
File extension SWZ	Adobe Flash Player Cache File
File extension TPS	Scam torrent file
File extension TVPI	TitanTV Television Listing File
File extension TVVI	TitanTV Television Listing File
File extension UCF	WebEx Media File
File extension UHTML	uHTML document file
File extension URL	Internet Shortcut
File extension VBD	Visual Basic ActiveX Document
File extension VBHTML	ASP.NET Razor Web Page
File extension VDW	Visio Web Drawing
File extension VLP	LiveSite Project
File extension VRML	VRML File
File extension VSDISCO	DISCO Dynamic Discovery Document
File extension WBXML	WAP Binary XML File
File extension WDGT	Opera Widget
File extension WEB	Xara Web Document
File extension WEBARCHIVE	Safari Web Archive
File extension WEBARCHIVEXML	Android Web Browser Archive
File extension WEBBOOKMARK	Safari Web Bookmark File
File extension WEBHISTORY	Safari Web History File
File extension WEBLOC	Mac OS X Website Location
File extension WEBSITE	Internet Explorer Pinned Site Shortcut
File extension WGP	Web Gallery Project
File extension WGT	Opera Widget File
File extension WHTT	HTTrack Website Copier File
File extension WIDGET	HybridJava Widget
File extension WML	Wireless Markup Language File
File extension WN	WN Web File
File extension WOA	WebObjects Application
File extension WRF	WebEx Recording
File extension WSDL	Web Services Description Language File
File extension XBEL	XBEL Bookmarks File
File extension XBL	Extensible Binding Language File
File extension XFDL	XFDL File
File extension XHT	XHTML File
File extension XHTM	Extensible Hypertext Markup Language Document
File extension XHTML	Extensible Hypertext Markup Language File
File extension XPD	XML Pipeline Document
File extension XSS	XML Style Sheet
File extension XUL	XML User Interface Language File
File extension XWS	Xara Web Designer Graphic
File extension ZFO	XSL-FO Online Form
File extension ZHTML	Secure IE Zipped HTML File
File extension ZUL	ZK User Interface File
File extension ZVZ	Malware file