.wab - Microsoft Outlook (Address Book file).
.wav - Resource Interchange File Format Waveform Audio Format or wav. A proprietary sound format sponsored by Microsoft and IBM. This is a high-quality audio file type generally used for applications that require high quality, such as CDs. WAV files are uncompressed, and therefore take up some disk space, unlike MP3s or AACs, which are compressed.
.wk1 - WK1 is a Lotus 1-2-3 (versions 1 and 2) spreadsheet. ( file extension .wk1 ).
.wma -WMA is an audio file format related to data compression that competes with the popular MP3 format. ( file extension wma )
.wmf - WMF is a Windows Meta File format. Native vector file format for the Microsoft Windows operating environment. When a WMF file is "played back" a graphic is rendered. These files are device-independant and have no limit to their size. ( extension wmf file type )
.wmv - Windows Media Video or wmv is a compressed video file format for several proprietary codecs. The screencast codec can capture live screen content, or convert video from third-party screen-capture programs into WMV 9 Screen files. ( file extension wmv )
.wpd - WPD file type is a text document created by Corel WordPerfect. Word Perfect is a popular word processing application. It supports formatted text, tables, forms, and images. It can be exported to other formats from within WordPerfect. ( file extension .wpd )
.wpg - WPG is a WordPerfect Graphics Metafile. Native graphics file format of the WordPerfect Corporation line of software products. These files may store bitmapped or vector graphics data, or Encapsulated PostScript data as well. ( file extension wpg )
.wps - WPS is a text document created with Microsoft Works Word Processor. WPS is similar to Microsoft Word (.DOC) document, but wps does not include advanced formatting options and macros that a Word document may contain. WPS can be opened with most versions of Microsoft Word as well as Microsoft Publisher. You can convert wps to doc with a converter. ( file extension wps )