There is only one file type that uses the .XBM extension:
X11 Bitmap Graphic
Bitmap image used by the X Window System (X11), a graphical user interface (GUI) used to manage networked client-server computers; stores a monochrome image that is written as plain text in the C programming language.
XBM images are compiled by a C compiler instead of an image program. They are used for storing icon and cursor bitmaps for X11.
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Updated: December 11, 2009