| .arj | relatively uncommon archive file |
| .bak | backup file |
| .bin | binhex file—Macintosh |
| .bmp | bitmap file |
| .cca | cc:Mail archive file |
| .cdr | Corel Draw data file |
| .cfg | configuration file |
| .cnt | MS Office file |
| .com | command file |
| .cpl | current privilege level file for WWW |
| .dat | data file |
| .dbf | database file |
| .dir | directory |
| .dll | dynamic link library—Windows file system |
| .doc | MS Word document |
| .dos | DOS file |
| .dot | MS Word template |
| .drv | printer driver file |
| .eps | encapsulated PostScript file |
| .exe | executable file—a program |
| .fon | font file |
| .ftg | MS Office file |
| .gid | MS Access file |
| .gif | graphics interchange format—an art file |
| .gz | G-zipped file—Unix-based compressed file |
| .hgx | Harvard Graphics file |
| .hlp | help file |
| .hqx | BinHex compressed file |
| .htm or .html | hypertext file—WWW page file |
| .ico | icon file |
| .inf | information file |
| .ini | initialization file—Windows file |
| .jpg | JPEG image file |
| .kbd | keyboard layout file |
| .lan | local area network file—a Novell system file |
| .lha | relatively uncommon archive file |
| .lo | QuarkXPress document—Macintosh |
| .log | log file |
| .lst | list file |
| .lzh | relatively uncommon archive file |
| .mim | mime-encoded file |
| .mpl | MS Project data file |
| .mpg | MPEG image file |
| .msg | message file |
| .nlm | NetWare Loadable Module—Novell |
| .nls | NetWare License Server—Novell |
| .pcd | photo CD file |
| .pct | PICT graphic |
| .pcx | PC Paintbrush graphic |
| .pdf | portable document format file—Adobe Acrobat |
| .pdr | printer description file—Macintosh |
| .pfb | Adobe printer font—binary |
| .pfm | Adobe printer font—metric |
| .pif | program information file—Windows shortcut file |
| .png | portable network graphics—image file format |
| .ppa | PowerPoint presentation file |
| .ppd | PostScript printer definition file |
| .ppt | PowerPoint document |
| .prn | MS Word print file—PostScript format |
| .ps | PostScript file |
| .psd | Adobe Photoshop native format file |
| .pub | MS Publisher document |
| .qxp | QuarkXPress document |
| .reg | registry file—Windows file systems |
| .rtf | rich text format—a form of text formatting |
| .rul | cc:Mail rule file |
| .sam | AmiPro file |
| .smi | system management interrupt—Intel |
| .sty | LaTeX style file |
| .swp | Windows swap file |
| .sys | DOS/Windows system file |
| .tar | tape archive file—Unix-based compressed file |
| .taz | .tar file that has been .z compressed |
| .tbl | Adobe table editor file |
| .tex | LaTeX file—a form of text formatting |
| .tif | tagged information format file—an image file |
| .tlb | MS Office executable file |
| .tmp | temporary file—Windows applications |
| .ttf | TrueType font file |
| .txt | text file, usually plain ASCII |
| .vbx | Visual Basic file |
| .vxd | virtual driver file—Windows |
| .wav | wave sound file |
| .wk1 | Lotus 123 spreadsheet file |
| .wks | MS Works file |
| .wmf | Windows metafile—a graphics file |
| .wpd | WordPerfect document |
| .wpg | WordPerfect graphic |
| .wq1 | Quattro Pro spreadsheet |
| .wri | MS Write document |
| .ws2 | WordStart 2 document |
| .xls | Excel spreadsheet file |
| .xtg | QuarkXPress document—PC |
| .z | compressed file from a Unix-based system |
| .zip | compressed file from WinZip |
| .zoo | relatively uncommon archive file |
