fsregen don't work!

Hi all,
I've been trying to get fsregen to work but it won't for love nor money! It keeps saying 'select valid input file. can't find test_0.asm' when I want it to open test.asm
What am I doing wrong! ???
I've been trying to get fsregen to work but it won't for love nor money! It keeps saying 'select valid input file. can't find test_0.asm' when I want it to open test.asm
What am I doing wrong! ???