A .MSK file is in fact a bitmap file. You can actually edit them with paintbrush.
Instead of creating one, you can take an existing .MSK and copy it to another file with the same name as your bitmap but with extension .MSK
>Hi @ all
>
>How can I create *.msk files from my *.bmp files?
>
>Thx
>Dustin
Hector Correa