y .a - UNIX static library file. y .ac - ACwin project file / GNU Autoconf configuration script / AC3D geometry file / Acceleration record file. y .acc - GEM desk accessories file. y .accdb - Microsoft Access 2007 database file. y .ace - ACE Archiver compression file. y .act - Action diagram (FoxPro) / Action File (Animation Master). y .acv - Adobe Photoshop compensation curve file. y .ade - Microsoft Access project extension. y .adp - Microsoft Access project file / Dynamic web page. y .adm - Addict Dictionary file / Group Policy Administrative Template file. y .afw - Bullion firmware file. y .agd - Agile Advantage file / AgileGraph data file. y .ai - PostScript viewer / Acrobat Illustrator vector graphics file / AIwin project file. y .aid - MapXtreme generated file. y .aif - Audio Interchange File. y .aifc - Compressed audio file. y .aiff - Audio Interchange File. y .ald - Axapta Label Data file. y .alg - ESRI Mapper File / HDLmaker file. y .als - Part of the Delphi help file system. y .amm - Adaptive Message Macro file. y .amp - Arbitrary Map file. y .amv - Audio-Video media file. y .ani - Animated cursor file. y .aod - Microsoft Dynamics AX Application Object Data file. y .apn - ApneaGraph data file / Wallpaper graphics file / REC Navigation application. y .app - VoxPro file / GEM file. y .aps - Binary file. y .arc - Compressed file. y .arj - Compressed file. y .as - Flash ActionScript file. y .asc - ASCII text file. y .ascx - Visual Studio custom user control source file. y .asf - Media player audio-visual file. y .asm - Assembler file / Solid Edge assembly file / Pro ENGINEER assembly file. y .asp - Active Server page. y .aspx - ASP.NET file. y .aspx.cs - Visual C# source file. y .aspx.resx .Net resource file. y .aspx.vb - VB.Net source file. y .atf - Adobe Transfer Functions file / Axon Text File. y .att - Email attachment. y .atx - Texture plugin (Animation Master) y .aty - 3D Topicscape association type file. y .au - µ-law sound file. y .aux - Auxiliary target file / Erdas Hierarchical File / LaTeX auxiliary reference file / ChiWriter auxiliary dictionary. y .av2 - Avatar2 model file (Animation Master) y .ava - Avatar model file (Animation Master) y .avi - Audio video file. y .awk - AWK script file. y .axe - AutoRoute map export file. y .bad - Generic bad (corrupt) file / Non-delivered email. y .bak - Generic backup file. y .bas - BASIC source code file. y .bat - MS-DOS batch file. y .bbc - BBC BASIC for Windows program or data file. y .bbt - BTwin database file / bbTracker GPS track file / Basket Ball Team file. y .bc - BCwin project file / BitComet intermediary download file / Big Crunch compressed archive / Byte Code (LLVM) file. y .bcd - Board/Chip description file. y .bck - VMS backup file. y .bdb - Back of Works database file. y .bdp - Bad mail pointer file / Combat Flight Simulator 3 file. y .bdr - Bad mail report file / Microsoft Publisher Border file. y .bfc - Windows Briefcase file. y .bil - Spot raster image file. y .bin - Generic binary / MacBinary encoded file / CD image. y .bk - Adobe FrameMaker book file. y .bkf - Windows backup file. y .bkp - backup file y .bks - Backup selection file. y .blk - Descent Mission Builder block file. y .bmc - Bitmap Cache file / Embroidery image file. y .bmp - Bit-map image file. y .bnk - Decent 2 FM sound instrument definition file. y .bpg - Borland Delphi project group file. y .bpl - Borland package library. y .brd - Layout file for EAGLE EDA system / BizInt Smart Charts file. y .brn - BrainStorm model file. y .brw - ProMash session file. y .bsc - Browse information file. y .bt - BTwin project file / EVwin project file / ILwin project file. y .btk - TeKton database file. y .btm - Batch to memory file. y .bud - Backup disk for Quicken. y .bup - Backup of a .ifo file. y .bva - Biovision action file. y .bvh - Biovision hierarchical motion file. y .bvp - BlueVoda Publication file. y .bz2 - Bzip2 compressed file. y .c - 'C' programming language source code. y .c4d - Clonk object definition file. y .c4f - Clonk scenario folder file. y .c4p - Clonk player file. y .c4m - Clonk material file. y .c4i - Clonk object info file. y .c4s - Clonk scenario file. y .c4q - Clonk queue file. y .c4v - Clonk video file. y .cab - Cabinet compressed file. y .cam - Camera file (Animation Master). y .cat - Security catalogue file. y .cbl - Cobol source file. y .cc - C++ source file. y .ccd - CloneCD control file. y .cct - Adobe Director protected cast resource file. y .cd - Class diagram file / CD-i OptiImage CD image file / cdTree CD catalogue file. y .cd4 - Dymo DiscPainter file. y .cda - Compact disk audio track. y .cdd - Claris Draw graphics file / CVI symbol table / CADEX drawing / ConceptDraw document / UML file. y .cdl - SignLab vector graphics file / Common Data Language file / CAD Advanced Design Language file. y .cdr - CorelDRAW drawing / Raw Audio-CD. y .cdt - Corel Draw template file. y .cdx - Visual FoxPro compound index. y .cer - Certificate file. y .cf - CFwin project file / Sendmail configuration file / Piranha configuration file / Zimbra configuration file. y .cfm - Cold Fusion mark-up file y .cfml - Cold Fusion mark-up language file. y .cfg - Delphi configuration file / Outlook configuration file / Netgear router configuration backup file. y .cgf - CargoMap file. y .cgi - CGI web based program or script. y .che - CHwinEHE project file / Chemical model file. y .chi - Help file index / ChiWriter document. y .chm - Compiled HTML help file. y .cho - Choreography file (Animation Master) y .chr - Charset file / Constraint Handling Rules file. y .chunk001 - First part of a File Splitter split file. y .chunk002 - Second part of a File Splitter split file. y .chunk003 - Third part of a File Splitter split file. y .cif - Easy CD Creator CD image file. y .cl - Common LISP source file / CLwin project file / Control Language file. y .class - Compiled Java class file. y .clp - Windows clipboard file. y .cls - Latex class file / VB6 class file / GSEA Phenotype data format file. y .clw - Class Wizard file / Clarion module file. y .cmd - Windows-DOS command script file. y .cmf - Corel Metafile. y .cml - PADGen company information file / Chemical Markup Language file. y .cn - CNwin account file / MIwin account file / ICM distance restraints file. y .cnt - Contents file for a windows help file. y .com - Executable command file. y .conf - Configuration file. y .coo - Coordinates file. y .cos2 - Pinnacle Studio file. y .cpl - Control panel item file. y .cpp - C++ language source file. y .cpt - Compact Pro file. y .cs - Visual C# source file. y .csp -Crystal Server Page / Caché Server Page. y .csproj - C# project file. y .css - Cascading style sheet file. y .cst - Adobe Director protected cast resource file / DesignWorks schema file / LogicWorks schema file. y .csv - Comma separated value file. y .ct - CTwin project file / Nucleic acid sequence and base pairing information file / Cheat table file. y .ctt - Messenger contacts file. y .cue - Cue sheet file. y .cur - Microsoft Windows cursor file. y .cvs - CANVAS file. y .cvx - CANVAS file. y .cwf - ClarisWorks file / COM-Watch File. y .cxt - Macromedia Director protected cast resource file. y .cxx - C++ language source file. y .da - DAwin project file. y .daa - Direct-Access-Archive CD/DVD image file y .dat - Generic data file / Mapinfo data file / c-tree plus database. y .db - Generic database file / Borland Paradox database file / Thumbnail cache. y .dbc - Visual FoxPro database file. y .dbf - dBASE III database file / dBASE IV database file / dBASE 5 database file / FoxPro database file / ArcView dBASE file. y .dbg - MS-Dev debug file. y .dbi - Delphi Database Explorer file. y .dbx - FoxPro table file / Outlook Express file. y .dcf - Copy protected media file container. y .dci - Delphi code template file. y .dcp - Delphi component package. y .dcr - Delphi component resource file / Shockwave file y .dct - Delphi file / FoxPro file / Aurora dictionary. y .dcu - Delphi compiled unit. y .dcx - FoxPro database index. y .dd - DDwin project file / Mac Disk Doubler compressed archive file. y .ddf - Diamond Directive File. y .ddi - DiskDupe image file. y .ddp - Delphi diagram portfolio file. y .deb - Package file. y .debuglog - MyDefrag log file. y .def - Windows library definition file. y .dem - Delphi file / Descent 1/2 demo file. y .dep - Dependency file. y .det - Descent Manager file. y .dfm - Delphi form file. y .dfn - Delphi support file for integrated translation environment. y .dft - Solid Edge drafting file. y .dir - Shockwave file. y .dg - Auto-trol vector graphics drawing file. y .dgn - MicroStation binary design file. y .dlg - Windows dialog resource file. y .dll - Dynamic Linked Library. y .dlm - (Microsoft) DownLoad Manager file / Akamai Download Manager file / 3ds Max file. y .dmg - Macintosh Disk Image. y .dmp - (Windows) Dump file. y .dmt - Delphi menu template file. y .do - ModelSim file / Stata command file. y .doc - Word document / Word Perfect document. y .docx - Microsoft Word (XML) document. y .dof - Delphi options file. y .dot - Microsoft Word template. y .dotm - Microsoft Word 2007 template supporting macros. y .dotx - Microsoft Word 2007 template. y .dpk - Delphi package. y .dpl - Delphi 3 package library. y .dps - DataPower script file. y .dr - DRwin project file / Digital Rights file / Disaster Recovery file. y .dro - Delphi object repository file. y .dpr - Delphi project file. y .drv - Driver file. y .drw - Brother word-processor file / Freelance file / Micrografx file / Autocad drawing / LinkWinds drawing. y .DS_Store - Mac OS X file describing the appearance of a folder. y .dsk - Delphi desktop file. y .dsm - Delphi symbol module / Visual Studio macro file. y .dsn - Tiny CAD file / ODBC File DSN. y .dst - Delphi desktop settings file. y .dti - Delphi 5 diagram portfolio file. y .dtp - Timeworks publisher text file. y .dun - Dial-up networking configuration file. y .dvf - Digital Voice File / Digital View Cam file. y .dvr-ms - Digital Video Recorder file. y .dwf - AutoCAD drawing. y .dwfx - AutoCAD drawing file. y .dwg - AutoCAD binary drawing. y .dwt - AutoCAD binary drawing template / Dreamweaver page template file / Expression Web Dynamic Web Template file.