(Notes: Some programs may use these extensions for other types of files. Never delete a file unless you have a ready backup or are absolutely sure what it is. Also, there are many other types of files that are not listed here; this is just a sample list of some of the most common extensions.)
??_ = LZW Compressed file for use with Expand command
CUR = Cursor
??K = Usually, if an extension ends with K, it is a backup file for a
DA0 = Registration backup file particular program (except BMK--Help Bookmark)
DAT = Program data file
??T = Possibly a Template file for the format that starts with the same
DBF = Database file (originally Dbase, but used by many programs) two letters
DCT = Adobe Illustrator Spelling Dictionary
3GR = Enhanced mode video grabber
DCX = DCX Image (Kodak Imager, maybe??)
ACL = MS Office AutoCorrect list
DES = Database description file (ACT!)
ACM = Microsoft Setup file
DIB = Windows Device Independent Bitmap
ACM = Audio Compression Codec
DIC = Custom dictionary
ACP = MS Office Assistant Character Profile (Actor)
DIF = Data Interchange Format
ACT = MS Office Assistant Character Actor file
DLL = Dynamic Link Library, program module that can be called by any
ADI = AutoCAD plotter file executable
AFM = Adobe Font Metrics
DOC = Documents (usually Microsoft Word for Windows)
AI = Adobe Illustrator drawing
DOT = Document template (usually Microsoft Word for Windows)
AIP = Adobe Illustrator Plugin
DRV = Device drivers
AKF = Adobe Acrobat Key file
DTB = Uninstaller smartlinks file
ANI = Animated cursor
DUN = Dial Up Networking configuration file
ANN = Help annotation file
DXF = AutoCAD drawing
APF = Adobe Acrobat Profile file
EPS = Encapsulated Postscript drawing file
ART = MS Internet Explorer Artwork
EXE = Executable program (application)
ASF = Streaming Audio/Video file
FAV = MS Outlook Bar shortcut
ASX = Streaming Audio/Video Shortcut
FDF = Adobe Acrobat Forms Document
AU = Digital recording file
FLI = Animation file
AVB = MS Chat Character
FLT = Adobe Illustrator Filter
AVI = Audio/Video Interleave (MS Movie), video clip
FLT = Graphics import/export filter
BAK = Backup files
FM = Adobe FrameMaker file
BAS = Basic program. Requires proper version of Basic language to run
FND = Windows Explorer saved search
BAT = Batch file of executable DOS commands
FON = Bitmap? Font
BFC = Windows Briefcase
FOT = TrueType Font reference file (also requires a .TTF file)
BGB = MS Chat Background
FRM = Form definition
BIN = Binary file (usually a program supplement)
FTG = Win95 Help Index file
BMK = Help file added bookmark file
FTS = Win95 Help Index file (allows word search within Help file)
BMP = bitmaps (Paintbrush picture)
GID = Windows 95 Help setup info file. Created first time you use the
BOOK = Adobe FrameMaker Book file. Modified when you access Help.
CAB = Cabinet files (compressed files for use by an installation program)
GIF = Graphics Image Format (CompuServe) bitmap
CAL = Calendar file
GRA = MS Graph chart
CBT = Computer Based Training (tutorial)
GRB = Grabber file (usually for Windows to interface with hardware)
CCC = MS Chat Conversation
GRP = Program Manager Application group (defines which icons are in
CCH = CorelChart which window)
CDA = CD Audio Track
HAV = High Quality Audio Video (movie)
CDF = Channel File
HGL = Hewlett Packard Graphics Language
CDR = CorelDraw drawing
HLP = Windows help files
CDT = CorelDraw template
HT = HyperTerminal file
CER = Security certificate
HTA = HTML Application
CFG = Program configuration file
HTM = Hyper text markup language (web page)
CGM = Computer Graphics Metafile (vector graphics)
HTML = Hyper text markup language (web page)
CHM = Compiled HTML file (often used for Help programs)
HTT = Hypertext Template
CHW = Compiled HTML help file index (can always be deleted safely)
HYP = Adobe Illustrator Hyphenation Dictionary
CIL = MS Clip Gallery Download Package
ICC = Windows 95 color management profile
CLB = Corel Draw compressed drawing library
ICL = Icon library
CLP = Clipboard Clip
ICO = Icon file (note: many .exe and .dll files also contain icons)
CMD = Windows NT command script
IDB = Quicken Inventory Database
CMP = lossy bitmap compression format
IDF = MIDI Instrument Definition
CMX = Corel Presentation Exchange
IDX = Index file
CNT = Windows Help Contents file
IIF = QuickBooks for Windows export file
CNV = File format converter file
INF = Setup information
COM = Executable DOS commands or programs
INI = Windows initiation files (information the system uses at program
CPE = Cover Page Editor document (Microsoft Fax) startup; user settings)
CPL = Control Panel Library (contains code for Control Panel functions)
ISP = Internet Communication Settings
CPS = Central Point Virus Checker tracking file
ITS = Internet Document Set
CPT = Corel Photopaint bitmap
JFF = JPEG bitmap
CRD = Cardfile card stack file
JFIF = JPEG image
CRT = Security certificate
JOB = Task Scheduler task object
CSS = Hyper Text Style Sheet
JPE = JPEG image
CSV = Comma Separated Value text data file
JPG = JPEG (Joint Photographic Experts Group) lossy bitmap
QUE = Task Scheduler Que Object compression format
REC = Recorder macro file
LDB = MS Access library file
REG = Registration information
LEX = Dictionary or thesaurus file
REP = Report template (ACT!)
LIB = Library file
RLE = Run Length Encoding, lossless bitmap/video compression format.
LNK = Win95 shortcut
RMI = Some kind of media player music file (similar to MIDI)
LOG = Log
RNK = Dial-up shortcut
LSF = Streaming Audio/Video file
RTF = Rich Text Format
LSX = Streaming Audio/Video Shortcut
RWZ = Outlook Rules Wizard Rule File
LZW = Lempel-Ziv-Welch, lossless bitmap compression format
SAM = Ami Pro document
M3U = Media Player media file
SBM = X bitmap image
MAD = MS Access Module Shortcut
SBX = Adobe Illustrator Tsume File
MAF = MS Access Form Shortcut
SCD = Microsoft Schedule+ calendar file
MAM = MS Access Macro Shortcut
SCF = Windows Explorer Command
MAQ = MS Access Query Shortcut
SCR = Screen saver
MAR = MS Access Report Shortcut
SCT = Windows Script component
MAT = MS Access Table Shortcut
SET = MS Backup settings file
MDA = MS Access Database Wizard or Template
SGI = Silicon Graphics Image
MDB = MS Access database
SHB = Shortcut into a document
MDW = MS Access workgroup information
SHD = Printer spooling file
MID = MIDI (Musical instrument digital interface) sound file
SHS = Scrap object
MIF = Adobe FrameMaker Interchange File
SLK = MS Excel Data Import
MIX = MS PhotoDraw graphic metafile
SND = Sound file
MMM = Multimedia clip
SNP = MS Access Report Snapshot (compressed)
MMM = Multiple Master metrics (Adobe)
SPL = Printer spooling file
MOV = QuickTime Movie
SPL = Shockwave Flash Object
MP3 = MP3 music file
SST = Certificate Store
MPC = MS Project calendar
STL = Certificate Trust List
MPD = MS Project Database file
STS = Windows Startup System File (deleted upon successful start)
MPG = MPEG compressed video
SWF = Shockwave Flash Object
MPP = MS Project project file
SWP = Swap file
MPT = MS Project template
SYD = Backup configuration files created by using SYSEDIT
MPW = MS Project Workspace
SYS = either text system files (like CONFIG.SYS) or system drivers
MPX = MS Project Exchange file
TAX = Tax program file
MSG = MS Exchange (Outlook) message
TGA = Targa bitmap
NK2 = MS Outlook AutoComplete entries list
TGA = Targa bitmap image
OAB = MS Exchange Offline Address Book
TIF = Tagged image file format (TIFF) bitmap format for scanned
OCX = Active X appletimages and photos
OFT = MS Outlook form template
TMP = temporary files. TMPs that start with ~ are Windows temp files
OLD = Copy of configuration file made during program installation
TPL = Template file (ACT!)
OPX = MS Org Chart file
TRM = Windows Terminal settings
OSS = MS office saved search
TRN = Translator
PAB = Win95 Personal Address Book
TTF = True Type font (note: also requires .FOT file)
PAL = Color pallette
TUT = Tutorial file
PAR = Windows Swap File
TXT = Text files (ASCII characters)
PAT = Bitmap pattern for filling drawing objects
UDL = Uninstaller backup file
PBK = Dial-up Phonebook
ULS = Internet Location Service
PCD = Kodak Photo CD bitmap
URL = Internet Shortcut (Uniform Resource Locator)
PCL = Printer Control Language file
VCF = MS Outlook vCard file
PCS = Microsoft Office Clipart Gallery
VCS = MS Outlook vCalendar file
PCX = PC Paintbrush bitmap
VIR = Norton Antivirus backup file
PDF = Adobe Acrobat Portable Document file
VSD = Visio drawing
PDX = Adobe Acrobat Catalog Index
VSS = Visio stencil
PFB = Printer Font binary (Adobe)
VXD = Virtual device driver
PFM = Printer Font Metrics (Adobe)
WAV = Wave digital audio sound file
PIC = Lotus graphics, or QuickTime picture
WBK = MS Word Backup
PIF = Program Information File (tells Windows how to run DOS apps)
WDB = MS Works database
PLT = HP plotter print file
WHT = MS NetMeeting Whiteboard
PM? = Performance Monitor file
WIZ = MS Word Wizard
PNG = Portable Network Graphics file (Internet bitmap)
WK* = Lotus 123 worksheet files
POL = Windows System Policy File
WKS = MS Works spreadsheet
POT = Powerpoint 95 presentation template
WLL = MS Word Add-In
PPA = MS PowerPoint Add-In
WLL = MS Word Link Library
PPS = MS PowerPoint slide show
WMF = Windows Metafile (vector graphics - clipboard format
PPT = Powerpoint slide show
WPD = Word Perfect Document (also used by ACT)
PRN = Printer file
WPS = MS Works document
PST = MS Exchange (Outlook) profile
WRI = Microsoft Windows Write documents
PT = Kodak Precision Transform
WSC = Windows Script component
PWL = Password Library file
WSH = Windows Scripting host settings
PWZ = MS PowerPoint Wizard
XIF = Wang(?) Image
QBB = QuickBooks for Windows backup file
XLA = Microsoft Excel for Windows add-in macro sheet
QBW = QuickBooks for Windows file
XLB = Microsoft Excel for Windows settings
QPC = Kaleidagraph plot file
XLC = MS Excel chart
QT = QuickTime video
XLD = MS Excel Dialog Sheet
XLK = MS Excel Backup
XLV = MS Excel VBA module
XLL = MS Excel Add-In
XML = XML web page markup language
XLM = Microsoft Excel for Windows macro sheet
XNK = Microsoft Exchange Shortcut
XLS = Microsoft Excel for Windows worksheets (spreadsheets)
XSL = XML style sheet
XLT = Microsoft Excel for Windows templates
ZIP = PKZip compressed file
If you're itching to delete those directories that start with a dollar sign. In a word, don't! Those files hold the information of your NTFS volume. Below is a list of all the files used by the file system:
$MFT—Master File Table
$MFTMIRR—A copy of the first 16 records of the MFT
$LOGFILE—Log of changes made to the volume
$VOLUME—Information about the volume, serial number, creation time, dirty flag
$ATTRDEF—Attribute definitions
$BITMAP—Contains drive cluster map
$BOOT—Boot record of the drive
$BADCLUS—A list of bad clusters on the drive
$UPCASE—Maps lowercase characters to uppercase version
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