| .arf | Automatic response file |
| .arh | Archivers definitions file (dn) |
| .ari | Compressed file archive (ari) |
| .arj | Compressed file archive (robert jung's arj) |
| .ark | - Arc archive (cp/m port of arc file archiver)
- Archive (managing your money)
- Compressed file archive (quark)
|
| .arr | - Arrangement (atari cubase)
- Bitmap graphics (amber arr image)
|
| .art | - Bitmap graphics (b&w) (many - first publisher - xara studio)
- Graphics (another ray tracer)
|
| .arx | Compressed file archive (arx) |
| .asc | - Armored encrypted file (pretty good privacy)
- Ascii text
- Bitmap graphics b&w ascii (grob graphic object) (hp-48sx calculator)
|
| .asd | - Autosave file (word for windows)
- Presentation (astound)
- Screen driver (lotus 1-2-3)
|
| .asf | - Datafile (statgraphics)
- Screen font (lotus 1-2-3)
- Video (advanced streaming format) (www)
|
| .ash | Assembly language header file (tasm 3.0) |
| .asi | Assembler include file (turbo c - borland c++) |
| .asic | Asic language source code file (asic) |
| .asm | Assembly language source code file |
| .aso | Assembler object (object orientated) file (turbo assembler) |
| .asp | - Active server page (html file with microsoft iis script)
- Aspect language script file (procomm plus)
- Association of shareware professionals note
|
| .ast | - Adobe color separtion table (adobe photoshop)
- Assistant file (claris works)
|
| .asx | Video (advanced streaming format) (www) |
| .at2 | Auto template (aldus persuasion 2.0) |
| .atk | Bitmap graphics (andrew toolkit raster object file) |
| .atm | Adobe type manager related file |
| .att | Bitmap graphics (at&t group 4) |
| .au | - Sound - basic 8bit ulaw compressed audio file (sun audio file format)
- австралия
австралия; |
| .aut | Automation (ipix) |
| .aux | - Auxiliary dictionary (chiwriter)
- Auxillary references (tex/latex)
|
| .ava | Publication (avagio) |
| .avb | Antiviral toolkit pro bases |
| .avi | Audio video interleaved (movie) (video for windows) |
| .avr | Sound (audio visual research file format) |
| .avs | - Animation (application visualization system)
- Bitmap graphics (avs x image file)
|
| .avt | Avatar-coding files (a3e) |
| .aw | - Text document (hp advancewrite)
- аруба
аруба; |
| .awa | Animation works accelerated movie (animation works) |
| .awd | Document (faxview - microsoft fax at work) |
| .awk | Awk language source code file |
| .awm | Animations works movie (animation works) |
| .aws | Data (statgraphics) |
| .awx | Custom application wizard |
| .b | Batch list (applause) |
| .b&w | - Bitmap graphics (mono binary screen image) (1st reader)
- Bitmap graphics (black and white) (atari - mac)
|
| .b_w | Bitmap graphics (black and white) (atari - mac) |
| .b1n | Bitmap graphics (both mono and color binary screen image) (1st reader) |
| .b30 | Printer font (jlaser - cordata) (ventura publisher) |
| .b4 | Nuts and bolts file (helix) |
| .b64 | Encoded file archive (ascii) (base64 mime) |
| .b8 | - Bitmap graphics (one byte per pixel) plane two (piclab)
- Red channel image data (24bit 3d animation) (cubicomp picturemaker)
|
| .bac | Backup |
| .bad | Bad file (oracle) |
| .bak | Backup |
| .bal | Music score (ballade) |
| .bar | - Compressed file archive (unix bar archive)
- Horizontal bar menu object file (dbase application generator)
|
| .bas | Basic language source code file (quickbasic - gw-basic) |
| .bat | Batch file (dos) |
| .bb | - Database backup (papyrus)
- барбадос
барбадос; |
| .bbl | Bibliographic reference (tex/bibtex) |
| .bbm | Brush (deluxe paint) |
| .bbnng | Bitmap graphics (bbn bitgraph terminal display pixel data (dpd) sequence) |
| .bbp | Bezier surface file |
| .bbs | - Bulletin board system announce or text info
- Hudson-style messagebase (ftn software)
|
| .bch | - Batch process object file (dbase application generator)
- Datafile (datalex entrypoint 90)
|
| .bck | Backup (vms) |
| .bco | Outline font description (bitstream) |
| .bcp | Makefile (borland c++) |
| .bcs | Browse information (windows95) |
| .bct | Backup dictionary (clarion) |
| .bcw | Environment settings (borland c++ 4.5) |
| .bdc | Dictionary (lingvo) |
| .bdf | - Binary update file (bupdate)
- Bitmap distribution format file (font - glyph) (adobe - x11)
- Datafile (egret)
|
| .bdr | Border (ms publisher) |
| .bdt | Dictionary (lingvo) |
| .bex | Binary extracted public key (pgp) |
| .bexpk | Binary extracted public key (pgp) |
| .bez | - Bezier surface file
- Outline font description (bitstream)
|
| .bf2 | Bradford 2 font |
| .bfc | Briefcase (windows 95) |
| .bfm | Font metrics (unix/frame) |
