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XBM is a native file format of The X Window System and is used for storing
cursor and icon bitmaps that are used in the X GUI. XBM files are quite
different in that they are actually C language source files that are
created to be read by a C compiler rather than a graphical display
program.

XBM data is typically found in headers (.h files) and are a series of
static unsigned char arrays containing the monochrome pixel data. There is
one array per image stored in the header.

XBM was created by the X Consortium as part of the X Window System. Refer
to the /bitmaps directory of the X Window distribution for examples of XBM
files. The central FTP distribution site for X version 11 is:

  ftp://ftp.x.org

Reference works describing XBM include:

  Xlib-C language X Interface, Gettys, James, and Robert W. Scheiffler,
  Consortium Standard, X Version 11, Release 5, First Revision, August 1991.

  Xlib Programming Manual, Nye, Adrian, third edition, O'Reilly & Associates,
  Inc. Sebastopol, CA, 1992.