2.
ACW - Windows Accessibility Wizard File
3.
AOS - ARCHOS PCtablet Firmware File
4.
APM - Aldus Placeable metafile
7.
APPX - Windows 8 App Package
9.
BAT - Batch file (executable)
10.
BCS - Boland Calibration Settings File
11.
BFC - Windows Briefcase File
12.
BIN - Generic Binary Executable File
13.
BK1 - Windows Indexing Service File
14.
BK2 - Windows Indexing Service Data File
15.
BKF - Windows Backup Utility File
16.
BLG - Windows Binary Performance Log File
17.
BMC - Bitmap Cache File
18.
BMK - PowerDVD MovieMark File
19.
CAB - Windows Cabinet File
21.
CAT - Microsoft Security Catalog file
22.
CDMP - WCS Device Model Profile
23.
CHK - ScanDisk file fragment
24.
CHL - Microsoft Internet Explorer channel information file
25.
CHM - Compiled HTML Help File
26.
CHT - Windows Chinese Traditional Noise-Word List File
27.
CLP - CrazyTalk Clip File
28.
CMD - Windows Command File
29.
CNT - Help Contents File
30.
COM - DOS Command File
32.
COV - Fax Cover Page File
33.
CPE - Fax Cover Page File
34.
CPI - Codepage Information File
35.
CPL - Windows Control Panel Item
36.
CRD - Windows CardSpace File
37.
CRDS - Windows CardSpace Backup File
38.
CRWL - Windows Crawl File
39.
CUB - Analysis Services Cube File
42.
DAT - Windows Registry Hive File
43.
DB - Windows Thumbnail Cache
44.
DDF - Diamond Directive File
45.
DECRYPT - Decrypted Microsoft ESD File
48.
DEV - Windows Device Driver File
49.
DIAGCAB - Troubleshooting Pack Cabinet File
50.
DIAGCFG - Troubleshooting Pack Configuration File
51.
DIAGPKG - Troubleshooting Pack File
52.
DIC - Dictionary File
53.
DIT - Active Directory Information Tree File
54.
DLL - Dynamic Link Library
55.
DL_ - Compressed DLL File
57.
EBD - Windows EBD System File
58.
EDB - Exchange Information Store Database
59.
EDRWX - XPS Drawing Document
60.
EX_ - Compressed Executable File
61.
EX_ - Renamed Windows Executable File
62.
E_E - Renamed EXE File
63.
FID - File Expander Engine Descriptions Database
64.
FID - Microsoft Catalog Indexing Service File
65.
FND - Windows Saved Search
66.
FNT - Windows Font File
67.
FON - Microsoft Windows bitmap font file
68.
FOT - Font Resource File
69.
FTG - Full Text Group
70.
FUL - Microsoft Backup File List
71.
FX - ReadyBoot Trace File
73.
GID - Windows Help Global Index File
74.
GMMP - WCS Gamut Map Model Profile
75.
GPD - Generic Printer Description File
76.
GRL - Windows Update Status File
77.
GRP - SmarterMail Group File
78.
H1Q - Microsoft Help Merged Query Index File
79.
HDMP - Windows Heap Dump
80.
HDS - Microsoft PlayReady Data File
81.
HHC - HTML Help Table of Contents
82.
HHK - HTML Help Index
83.
HHT - Help and Support Center HHT File
84.
HLP - Windows Help File
85.
HSH - Windows Catalog Search Index File
86.
HTA - HTML Application
87.
HTT - Hypertext Template File
88.
HXT - Microsoft Help 2 Table of Contents File
89.
ICL - Windows Icon Library File
90.
ICM - Image Color Matching Profile
91.
IME - Windows Input Method Editor File
92.
INF - Setup Information File
93.
INF_LOC - Windows Driver Information Cache File
94.
INI - Windows Initialization File
95.
INS - Internet Settings File
96.
ITEMDATA-MS - Windows 8 Start Screen Item Data File
97.
ITS - Internet Document Set
98.
JOB - Windows Task Scheduler Job File
99.
JPN - Windows Japanese Noise-Word List File
100.
JRS - Exchange Reserve Transaction Log File
101.
JS - JavaScript File
102.
JSE - JScript Encoded File
103.
KBD - Keyboard Layout Script
104.
KDMP - Windows Crash Dump File
105.
KOR - Windows Korean Noise-Words List File
106.
LCK - Program Lock File
107.
LGC - SimpleK Database File
108.
LGF - PMSCAN Log File
109.
LGI - Multimedia Logic File
110.
LGL - LeechGet Download List
111.
LIBRARY-MS - Windows Library Description File
112.
LNK - Windows File Shortcut
114.
LOG1 - Windows Registry Hive Log File
115.
LOG2 - Windows Registry Hive Log 2 File
116.
MAI - Microsoft Mail File
117.
MAILHOST - MSN Mailhost Settings File
118.
MANIFEST - Windows Application Manifest File
120.
MAZ - Hover! Maze File
121.
MCI - Media Control Interface File
122.
MDMP - Windows Minidump
123.
MFT - MediaFACE Project Template
124.
MIG - Windows Migration Backup File
125.
MLC - Microsoft Language Interface Pack
126.
MOF - Managed Object Format File
127.
MPV2 - MPEG-2 Video Stream
128.
MSC - Microsoft Management Console Snap-in Control File
129.
MSD - Map Service Definition File
130.
MSI - Windows Installer Package
131.
MSN - Host Blocking File
132.
MSP - Windows Installer Patch
133.
MSRCINCIDENT - Windows Remote Assistance Invitation File
135.
MST - Windows Installer Setup Transform File
136.
MSWMM - Windows Movie Maker Project
137.
MUI - Multilingual User Interface File
139.
MVB - Multimedia Viewer Book Source File
140.
MYDOCS - Send To My Documents
141.
NLS - Microsoft National Language Support File
142.
NT - Windows NT Startup File
143.
OCX - ActiveX Control
144.
OEM - OEM Setup File
145.
OSC - Remote Installation Services client installation wizard file
146.
OSDX - Search Connector Description File
148.
P7B - PKCS #7 Certificate File
149.
P7C - PKCS #7 Certificate File
150.
P7R - Certificate Request Response File
151.
PAL - Painter Custom Palettes File
152.
PBK - Dial-Up Phone Book File
153.
PDR - Windows Port Driver
154.
PERFMONCFG - Performance Monitor Configuration File
155.
PFM - Printer Font Metrics File
156.
PFX - PKCS #12 Certificate File
157.
PIF - Program Information File
158.
PNF - Precompiled INF File
159.
PRF - Preferences or profile file
160.
PRF - Windows System File
162.
PS1 - Windows PowerShell Cmdlet File
163.
PS1 - Microsoft Indexing Service Data File
164.
PS2 - Microsoft Search Catalog Index File
165.
PSC1 - Windows PowerShell Console File
166.
PSD1 - Windows PowerShell Data File
167.
PSM1 - Windows PowerShell Script Module File
168.
PWL - Windows Password List
169.
QDS - Windows Directory Query File
170.
QIC - Windows Backup File
171.
RBF - Windows Installer Rollback File
172.
RBK - Windows 95 Registry Backup File
173.
RDP - Remote Desktop Configuration File
175.
RELOC - Windows EXE Relocation Section File
176.
RESMONCFG - Resource Monitor Configuration File
177.
RMD - RED Metadata File
178.
RS - Windows Rating System File
179.
SCF - Windows Explorer Command
180.
SCR - Windows Screensaver
181.
SCT - Scitex Continuous Tone File
185.
SFCACHE - ReadyBoost Cache File
186.
SFX - Windows Self-Extracting Archive
187.
SHB - Windows Document Shortcut
188.
SHD - Windows Print Job Shadow File
189.
SHS - Microsoft Scrap File
190.
SLUPKG-MS - XrML Digital License Package
191.
SP3 - Windows XP SP3 CD File
192.
SPL - Windows Print Spool File
193.
SQM - Service Quality Monitoring File
197.
SYS - Windows System File
198.
T2 - TrueType font file
199.
THA - Windows Thai Noise-Words List File
200.
THE - Microsoft Plus! Theme File
201.
THEME - Microsoft Plus! Desktop Theme
202.
TLB - OLE Type Library
203.
TMP - Temporary File
204.
TRX_DLL - Windows Startup File
205.
TSC - Microsoft Windows WinHelp related file
206.
TTC - TrueType Font Collection
208.
TX_ - Compressed Text File
209.
UCE - Windows UCE System File
210.
UDL - Microsoft Universal Data Link File
212.
VBE - VBScript Encoded Script File
214.
VGA - VGA Display Driver
215.
VGD - Generic CADD VGA Driver
216.
VHD - Virtual PC Virtual Hard Disk
217.
VHDX - Windows 8 Virtual Hard Drive File
218.
VXD - Virtual Device Driver
219.
VX_ - Compressed Virtual Device Driver File
220.
WAB - Windows Address Book
221.
WDF - Workshare Compare DeltaFile
222.
WEBPNP - Web Point and Print File
223.
WER - Windows Error Report
224.
WIN - Windows Backup File
225.
WMP - Windows Media Photo File
227.
WSC - Windows Script Component
228.
WSF - Windows Script File
229.
WSH - Windows Script Host Settings
230.
XDR - XML-Data Reduced File
231.
XOML - Windows Workflow File
232.
XPS - XML Paper Specification File
233.
XRM-MS - Microsoft Security Certificate
236.
000 - Indexing Service Data File
237.
386 - Windows Virtual Device Driver