Web File Extensions

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/