Archive formats:

-arc
-arj
-Microsoft archive format (cab)
-lzh, lha
-pma
-rar
-uc2
-zip
-zoo
-Ms Compress archive (??_, ??$)
-StuffIT Expander archive format (sit)
-lzx
-ace
-GZIP file (gz)
-UUEncoded file (uue)
-JAR archive (j, jar)
-Java ARchive (jar)
-Compressed archive (ark, pak)
-Macintosh archive format (cpt)
-Lempel Ziv Huffman archive (ice)
-StuffIT Expander archive format (sea)
-Archive for Unix (taz, sqz, z)

Graphical Formats:

-Adobe Illustrator (ai) or Encapsulated Postscript (eps)
-OS/2 Warp image (bga)
-Windows Bitmaps (bmp, dib, rle)
-CALS Compressed Bitmap (cal)
-CorelDraw vector images (cdr, cdt, pat)
-Dr. Halo image (cut)
-Micrografix Draw Image (drw)
-AutoCAD drawing (dwg)
-Autodesk AutoCAD (dxf)
-FastCad or EasyCad drawing (fcd)
-Flex. Image Transport (fit)
-GEM vector image (gem)
-Graphics Interchange Format (gif)
-Windows Icon Resource (ico)
-Amiga image (iff, lbm)
-GEM Paint/Ventura (img)
-JPEG - JFIF Compliant image (jpg, jif, jpe)
-MacPaint bitmap image (mac, pnt)
-Enhanced Windows Metafile (emf)
-Microsoft Paint (msp)
-Portable Bitmap image (pbm)
-PC Paintbrush bitmap image (pcx)
-Portable Graymap image (pgm)
-PC Paint/Pictor (pic)
-Portable Network Graphics (png)
-Portable Pixelmap (ppm)
-Adobe Photoshop (psd)
-Sun Raster Images (ras)
-RIFF image (rif)
-Compuserve bitmap image (rle)
-Scitex CT bitmap-image (sct)
-Truevision TarGA bitmap image (tga)
-Tagged Image File Format (tif) or Corel Photo-Paint (cpt)
-Windows MetaFile image (wmf)
-WordPerfect Graphic (wpg)
-WordPerfect color Palette (wpp)
-Wavelet Compressed Bitmap image (wvl)
-IoCA ICon Archive (ica)
-Jasc Browser File (jbf)
-OS/2 METafile (met)
-Lotus Freelance Image (drw)
-SoftImage (pic, si)
-Vista image (vst)
-Vivid image (img)
-ShockWave Flash (swf)
-Sony PlayStation Bitmap image (tim)
-ZSoft PC Paintbrush Multi-Page PCX (dcx)
-Casio digital camera (cam)
-Paint Shop Pro file (psp)
-TerraGen World (tgworld, tgw)
-TerraGen SuRFace MAP (srfmap, srf)
-TerraGen Terrain (terrain, ter)
-TerraGen CLouD LaYeR (cldlyr, cld)
-TerraGen ATMoSPHeRe (atmsphr, atm)
-Graphic Workshop THumbNail (thn)
-Amidraw vector image (sdw)
-Lotus SMartIcon (smi)
-Ulead Image Pals ALbuM (abm)
-LightWave Objects file (lwo)
-LightWave Scene file (lws)
-Autodesk 3D Studio 3D object (asc, 3ds)
-Caligari trueSpace 3D object (cob, coa)
-VideoScape 3D object (geo)
-3D object, Imagine 1, 2 or Turbo Silver (iob)
-RealiMation 3D Object (rbs)
-Amiga Sculpt 3D/4D 3D object (scene)
-STereoLithography 3d object if saved as ASCII (stl)
-WaveFronT 3D object (wft)
-Hierarchical Data Format image (hdf)
-Multiple-image Network Graphics (mng)
-Quickdraw 3D file (3dm)
-OpenFlight file (flt)
-IGES 3D file (igs, iges)
-Portable aNyMap image (pnm)
-Adobe PostScript Interpreted (ps)
-X Windows system BitMap image (xbm, bm)

Multimedia, Sound:

-Avi movies (avi)
-MIDI-sequention sound (mid)
-Apple QuickTime MOVie (mov)
-MPEG movie (mpg)
-Soundblaster Sound (voc)
-WAVe PCM Sound (wav)
-CD Audio song (cda)
-Autodesk Animator Animation (fli)
-Autodesk Animator Animation (flc, cel)
-Amiga sound (mod, nst)
-DeluxePaint ANiMation (anm)
-Apple sound (afc)
-Audio Interchange File Format from Apple/SGI (aif)
-Amiga .8SVX, Audio Interchange File Format (iff)
-Sound Sun/NeXT/DEC (au)
-DiamondWare digitized sound (dwd)
-MATlab sound (mat)
-MIDI Sample sound (sds)
-SaMPleVision sound (smp)
-MIDI-sequention sound (rmi)
-MultiTracker Module music (mtm)
-Lotus ScreenCam Movie (scm)
-RealMedia (rm, ram)
-RealAudio (ra)

Wordprocessing, Database, Spreadsheets, DTP, etc.:

-Corel Presentation Exchange (cmx)
-Data Interchange Format (dif)
-Ms Word document (doc) or template (dot)
-DisplayWrite (doc) or IBM dca-rft (rft)
-Envoy files (evy)
-Html-files (htm, html)
-Access database (mdb)
-Portable Document Format (pdf)
-Adobe Type 1 Font (pfb)
-HPGL Plotter File (plt)
-Rich Text Format (rtf)
-Ami Professional document (sam)
-TrueType Font (ttf)
-Quattro Pro spreadsheet (wb1, wb2, wq1)
-Lotus 1-2-3 spreadsheet (wk1, wk3, wk4)
-Ms Works database (wdb)
-Ms Works spreadsheet (wks)
-Ms Works document (wps)
-WordPerfect text (e.g. wpd, doc, wp5, wp6)
-WordPerfect Macro ReSource (mrs)
-Ms Works document (wps)
-Windows Write text (wri)
-Ms Excel spreadsheet (xls) or template (xlt)
-Ms Office Binder document (obd) or template (obt, obz)
-Ms PowerPoint (pot)
-Paradox DataBase (db)
-Lotus Freelance (pre, mas, sym)
-Lotus Freelance PortFoLio file (pfl)
-Ms Schedule+ PRinT (prt)
-Lotus Approach dBASE index (adx)
-WordStar 7.0 document (ws7)
-Ms Schedule+ 7.0 file (scd)

Internet Related:

-Netscape Mail (no extension)
-Html file (e.g. html, htm, htt, cgi, etc.)
-VRML Worlds for WWW (wrl)
-Java Class (class)
-Channel File (cdf)
-Compiled HTML file (chm)
-Internet Explorer command (scf)
-Internet Shortcut (url)
-Outlook InDeX file (idx)
-Outlook MailBoX file (mbx)
-Outlook Express VCard file (vcf)
-Saved email or newsgroup message

Miscellaneous:

-Moving cursor (ani)
-Windows Clipboard (clp)
-Help Contents File (cnt)
-Windows Cursor Resource (cur)
-Executables (com, exe, dll etc.)
-IBM dca-fft (fft)
-Visual Basic FoRM file (frm)
-Windows program-group (grp)
-Windows Help (hlp)
-Windows help file index (gid)
-Windows Shortcut (lnk)
-Shortcut to MS-DOS program (pif)
-Registration file for W95 (reg)
-SYmbolic LinK (slk)
-Dynamic Link Library (tlb)
-CeQuadrat CD ProJect file (cpj)
-Stored search W95 (fnd)
-Uninstall scripts (isu)
-Windows Password file (pwl)
-Fax cover page (cpe)
-Ms Windows Registry
-System.ini
-Turbo Pascal Unit (tpu)
-Windows application log (lgc, lgd, lge, lgf)
-Windows Full Text Search (fts)