Common File Types

Font Files

.fnt   Windows Font File
.fon   Generic Font File
.otf    OpenType Font
.ttf    TrueType Font

System Files

.cab   Windows Cabinet File
.cpl    Windows Control Panel Item
.cur    Windows Cursor
.deskthemepack    Windows 8 Desktop Theme Pack File
.dll   Dynamic Link Library
.dmp   Windows Memory Dump
.drv   Device Driver
.icns   Mac OS X Icon Resource File
.ico   Icon File
.lnk  Windows File Shortcut
.sys   Windows System File

Settings Files

.cfg   Configuration File
.ini   Windows Initialization File
.prf   Outlook Profile File

Encoded Files

.hqx  BinHex 4.0 Encoded File
.mim   Multi-Purpose Internet Mail Message File
.uue   Uuencoded File

Compressed Files

.7z   7-Zip Compressed File
.cbr   Comic Book RAR Archive
.deb   Debian Software Package
.gz   Gnu Zipped Archive
.pkg   Mac OS X Installer Package
.rar   WinRAR Compressed Archive
.rpm    Red Hat Package Manager File
.sitx   StuffIt X Archive
.tar.gz   Compressed Tarball File
.zip      Zipped File
.zipx    Extended Zip File

Disk Image Files

.bin   Binary Disc Image
.cue   Cue Sheet File
.dmg   Mac OS X Disk Image
.iso   Disc Image File
.mdf   Media Disc Image File
.toast   Toast Disc Image
.vcd   Virtual CD

Developer Files

.c    C/C++ Source Code File
.class   Java Class File
.cpp    C++ Source Code File
.cs    Visual C# Source Code File
.dtd    Document Type Definition File
.fla    Adobe Flash Animation
.h   C/C++ Header File
.java   Java Source Code File
.lua   Lua Source File
.m   Objective-C Implementation File
.pl   Perl Script
.py   Python Script
.sh   Bash Shell Script
.sln   Visual Studio Solution File
.vcxproj   Visual C++ Project
.xcodeproj   Xcode Project

Backup Files

.bak   Backup File
.tmp   Temporary File

Misc Files

.crdownload   Chrome Partially Downloaded File
.ics    iCalendar File
.msi    Windows Installer Package
.part    Partially Downloaded File
.torrent   BitTorrent File