List of File extensions
      *B: binary file
      *A: ASCII file
      < >: Recommend software

Extension    Description            File     How to use  
                                       type     the file  

.acr        ACR-NEMA medical       B
             image file
.aif(c)     sound (Apple, SGI)     B        sound player    
.aif(f)     sound (Apple, SGI)     B        sound player
.arc        DOS compression        B        decompress <pkunpak>

.arj        compressed             B        decompress <arj241a>
.art        First Publisher
             Clip Art file
.ASC        image                  B        image viewer    
.au         music                  B        ULAW player <goldwave>
.avi        video (MS Windows)     B        avi viewer <media>
.avr        sound                  B        sound player
.avs        animation              B        image viewer
.bac        binary backup          B                          
.bas        Basic file             B        run in QBasic
.BBM        image                  B        image viewer <gds>
.bck        VMS backup             depends
.BIG        Chinese (old version)  B        Chinese viewer <cwd>
.BIG5       Chinese (old version)  B        Chinese viewer <njstar>

.BMF        image                  B        image viewer <gds>
.bmp        picture (Bitmap)       B        picture viewer <display>
.BOO        image                  B        image viewer <msbpct.exe>
.byu        movie byu file         B
.CGM        Computer Graphics    
             Metafile              B        CGM viewer       
.clp        picture                B        picture viewer <display>
.cmf        music                  B        music player <playcmf>
.com        compressed             B        decompress <comto010d.zip>

.com        executable file        B        type the file name to run
.com        VMS command file       B
.cpt        Macintosh Compressed   B        decompress
.CUR        image                  B        image viewer
.CUT        image                  B        image viewer <cshow>
.dat        VMS data file              
.des        text                   A        word processor
.DCS        image                  B        image viewer
.DIB        picture (Bitmap)       B        picture viewer <display>
.dig        text                   A        word processor
.dl         animated picture       B        dl viewer <display>
.dlg        image                  B        image viewer
.DMS        compressed             B        decompress
.doc        text                   A        word processor
.dvi        special TeX text       A    
.dwc        archive                B        decompress <zzap>
.DWG        image                  B        image viewer
.dxf        ASCII Drawing          A        <autocad>
             Interchange
.eps        Encapsulated Post-     B        PostScrip viewer
             Script image               
.euc        Japanese (Kanji)       B        Japanese reader
.exe        self-extracting file   B        type "filename" to run 
.exe        executable file        B        type "filename" to run
.F          Freeze for UNIX        B        unfreeze <freeze>

.fac        picture                B        picture viewer <display>
.fit(s)     image                  B        image viewer <display>
.flc        animated picture       B        picture viewer <display>
.fli        animated picture       B        picture viewer <display>
.flx        image                  B        image viewer <gds>
.fssd       sound                  B        sound player
.gds        image                  B        image viewer <gds>

.gb         Chinese                B        Chinese viewer <njstar>
.gif        picture                B        picture viewer <lview>
.gl         animated picture       B        picture viewer <display>
.gry        picture                B        picture viewer <display>
.gz         compressed             B        decompress <gzip124>
.gzip       compressed             B        decompress <gzip124>

.h          text                   A        word processor
.ha         compressed             B        decompress
.ham        image                  B        image viewer <gds>
.hlb        VMS help libraries     A
.hlp        VMS help files         A
.HPK        compressed             B        decompress <hpack78.zip>
.hqx        Macintosh compressed   B        decompress <dehqs>
.HRZ        image                  B        image viewer <graphics>  
.HYP        compressed             B        decompress <hyper25.zip> 
.hz         Chinese                B        Chinese viewer <cwd>

.ibm        picture                B        picture viewer <display>
.ice        archive                B        decompress
.ico        image                  B        image viewer <gds>
.ief        image                  B        image viewer     
.iff        many types of binary   B        image viewer
             data 
.IMG        picture                B        picture viewer <display>
.ish        compressed             B        decompress <ish200.lzh>
.jas        image                  B        image viewer (Paint Shop Pro>
.JBIG       image                  B        image viewer
.JFI        image                  B        image viewer
.jis        Japanese               B        Japanese reader
.jpc        picture                B        picture viewer <display>

.jpg        picture                B        picture viewer <lview>
.LBM        image                  B        image viewer <gds>
.lbr        archive                B        decompress <lue220>
.lha        compressed             B        decompress <lha213>
.lis        program listing        A        DOS editor
.lm8        picture                B        picture viewer <display>
.LZH        compressed             B        decompress <lha213>

.LZS        compressed             B        decompress <larc333.zip>
.LZX        compressed             B        decompresse
.lzw        LHWarp archive         B        decompress
.MAC        picture                B        picture viewer <cshow>
.mag        picture                B        picture viewer <display>
.man        text manual            A        word processor
.map        image                  B        image viewer
.MAT        sound                  B        sound player <goldwave>
.md         compressed             B        decompress <zzap>
.mgf        image                  B        image viewer
.mhg        multimedia             B        multimedia player
.mid        music                  B        midi player <music121>

.mki        picture                B        picture viewer <display>
.mod        music                  B        mod player <mod4win>
.mp2        audio                  B        audio player
.mpa        audio                  B        audio player
.mpg        multimedia             B        mpeg player
.mps        multimedi              B        mpeg player
.mrb        image                  B        image viewer
.MSP        mage                   B        image viewer
.MTM        sound                  B        sound player
.mtv        picture                B        picture viewer
.nff        image                  B        image viewer
.nst        sound                  B        sound player
.off        image                  B        image viewer
.omf        image                  B        image viewer
.pak        compressed             B        decompress <zzap>
.pbm        picture                B        picture viewer <display>
.pcd        Kodak photo CD         B        picture viewer <display>
.pcc        image                  B        image viewer <gds>

.pcm        sound                  B        sound player <goldwave>
.pct        picture                B        picture viewer <display>
.pcx        picture(Paintbrush)    B        picture viewer <display>
.pdf        image                  B        Acrobat Reader
.pds        picture                B        picture viewer <display>
.pgm        picture                B        picture viewer <display>
.pic        picture                B        picture viewer <display>

.pict       picture (Macintosh)    B        picture viewer
.pit        Macintosh compressed   B        decompress
.pm         picture                B        picture viewer <display>
.png        image                  B        image viewer
.pnt        MacPaint               B        image viewer
.pol        music                  B        music player
.pp         Amiga compressed       B        decompress <pplib>
.ppm        video                  B        picture viewer <display>
.ps/.psid   picture/text           B        picture viewer <display>
.ps         laser printer file     A        word processor
.ras        picture                B        picture viewer <display>
.RAX        image                  B        image viewer <gds>

.RAW        animated picture       B        picture viewer <display>
.rgb        picture                B        picture viewer <display>
.rmi        sound                  B        sound player
.rle        picture                B        picture viewer <display>
.ROL        sound                  B        sound player
.s3m        sound                  B        sound player
.scx        image                  B        image viewer (CShow>
.sdn        shell archive          B        decompress <zzap>
.sea        self-extracting (Mac)  B        type "filename" to run
.sf         sound                  B        sound player
.sgi        picture                B        picture viewer <display>

.shar       shell archive          A        unshell <unshar>
.shg        image                  B        image viewer
.SHK        compressed (Mac)       B        decompress
.sit        compressed (Mac)       B        decompress
.snd        music                  B        music player <goldwave>
.sqz        squeeze for MSDOS      B        decompress
.?q?        squeeze                B        decompress
.stm        sound                  B        sound player
.tar        tape archive           B        untar
.tar.gz     compressed tar         B        decompress and untar
.tar.Z      compressed tar         B        decompress and untar
.tdo        compressed             B        decompress <teled121>
.TGA        picture                B        picture viewer <display>
.tif(f)     image                  B        image viewer
.txt        text                   A        word processor
.uc2        compressed             B        decompress <uc2ins>   
.ul         sound                  B        sound player
.UTL        sound                  B        sound player
.uue        uuencoded              A        decode <uudecode>

.uud        uudecoded              B
.vic        picture                B        picture viewer <display>
.vik        picture                B        picture viewer <display>
.vis        picture                B        picture viewer <display>
.voc        sound                  B        sound player
.WAV        sound                  B        sound player <goldwave>
.WMF        image                  B        image viewer
.XBM        picture (X Windows)    B        picture viewer <display>
.xm         sound                  B        sound player
.xpm        picture                B        picture viewer <display>

.XWD        image                  B        image viewer
.Y          compressed             B        decompress <yabba>
.yuv        image                  B        image viewer <display>
.Z          compressed             B        decompress
.zip        compressed             B        decompress <pkunzip>
.zoo        compressed             B        decompress <zoo210>
.zw         Chinese                B        Chinese viewer

For more extensive image file formats, please check Image File Formats List

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