|Could you not use|
FOR /F %%i IN (FILESTODELETE.TXT) DO (
IF NOT EXIST %%i ECHO %%iDOES NOT EXIST!
You could then puit the list of files to delete in the FILESDOTDELETE.TXT file, after the delete, it will say if it has deleted sucessfully.
I can't think of how else you could adapt DEL as it simply only outputs error levels of 0....