File Extension Glossary

http://www.gateway2000.com/support/custserv/glossary/fileformat/x.htm (Amiga Plus Extra No. 5, 08/1997)

*.xbm*		X11 bitmap file format. Native file format of the X Window System used for storing cursor and icon bitmaps that are used in the X Window interface. XBM files are actually C language source files that are created to be read by a C compiler rather than a graphical display program.
*.xdp*		Xdataplot. These files contain only the name of the data file to which they refer. This allows viewing of large sequential datasets like those generated by electrophysiological recording.
*.xls*		Excel Spreadsheet format. Native file format used by the Microsoft Excel spreadsheet program.
*.xm*		Extended Module format. Used by UNIX-type OSs for music. Also known as Fasttracker II format.
*.xpm*		X11 pixmap file format. Standard for storing monochome, gray-scale, and color pixmap data to disk under the X Window system. These files, like .xbm files, are C source code files, with each pixmap being defined as a static char array.
*.xwd*		X Window Dump format. Used to store screen dumps created by the xwd client process in the X Window System. The image of any window or the background may be saved (dumped) to an .xwd file.