Decompression question

[Tim]

I posted this question before, so here it is one more time with fingers
crossed:

Under OS X. Now when I try to  decompress someProject.rev, I get the
following error message:

Error description: decompress: string is not compressed data

SomeProject.rev does not open. While compressing it and uploading is no
problem. I should add that both comression/decompression work fine under
W2K. The problem is only under OS X. Anyone have any thoughts?

TIA
-- 
Tim