what you have to do is put the .abr or paintshop .jbr files in the gimp brushes directory, usually:
and reload the gimp.
[line]
Secondly, if you want to convert other type of brushes to gimp default type brush .gbr files, then I found a tool that allows to convert photoshop brush files .abr to gimp brush files .gbr.
I have tested this tool myself and found 100% results.
[*] windows users download it here
http://the.sunnyspot...r2gbr-1.0.2.zip
[*] source for other platforms
http://the.sunnyspot...r2gbr-1.0.2.tgz
actual page
http://the.sunnyspot...ls.html#abm2gbr
btw you may download 1100 new brushes here
http://www.cybia.co.uk/brushes.htm

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