1.
APNG - Animated portable network graphics file
2.
BAK - Firefox Bookmarks Backup
3.
CER - Internet Security Certificate
4.
CHM - Compiled HTML Help File
5.
CPC - CPC Compressed Image File
6.
CRT - Security Certificate
7.
DBM - ColdFusion Server File
9.
DTAPART - DownThemAll! Partially Downloaded File
10.
HTM - Hypertext Markup Language File
11.
IIM - iMacro Macro File
12.
JP2 - JPEG 2000 Core Image File
14.
JPX - JPEG 2000 Image File
15.
JSON - JavaScript Object Notation File
16.
JSP - Java Server Page
18.
MAFF - Mozilla Archive Format File
19.
MAR - Mozilla Archive
20.
MDDATA - iPhone Backup File
21.
MHTML - MIME HTML File
22.
MJPG - Motion JPEG Video File
23.
MNG - Multiple Network Graphic
24.
NMF - ArcGIS Explorer Map File
25.
ODC - Office Data Connection File
26.
ODO - Online Operating System Write Document
27.
OWC - OutWit Catch Database
28.
OWG - OutWit Gear Database
29.
OWM - OutWit XML Mashup File
30.
PAC - Proxy Auto-Config File
31.
PART - Partially Downloaded File
32.
PDB - Protein Data Bank File
33.
PDF - Portable Document Format File
35.
QRM - Qworum Message File
36.
RDF - Resource Description Framework File
37.
RMT - Router Firmware File
38.
RSA - RSA Certificate File
39.
RSS - Rich Site Summary
40.
SESSION - Mozilla Firefox Session File
41.
SLT - Mozilla User Profile Folder
44.
URL - Internet Shortcut
45.
WEBLOC - Mac OS X Website Location
46.
WEBM - WebM Video File
47.
WML - Wireless Markup Language File
48.
WOFF - Web Open Font Format File
49.
XBAP - Microsoft Silverlight application package
50.
XBL - Extensible Binding Language File
51.
XHTM - Extensible Hypertext Markup Language Document
52.
XHTML - Extensible Hypertext Markup Language File
53.
XPI - Mozilla Installer Package
54.
XPS - XML Paper Specification File
55.
XPT - Mozilla Firefox Component
56.
XUL - XML User Interface Language File
57.
ZUL - ZK User Interface File