.xbm

[Brian Hays]

Try looking here http://filext.com

I did & it came up with some gobbledegook (to me) may help some tho?

What are you doin inside on a day like today? you should be outside! come to think of it so should I, ta ta! 🙂

[Frank Droog]

Try opening the file with Notepad, or a hex editor if you have one.
It may be all binary gibberish but there may be text indicating what kind of file it is and what program created it.
If the link above is correct, then it may be a Unix XWindows bitmap.

frank at cadlink