Int 21 Fn 41  - DOS 2+ - "unlink" - Delete File                            [D]

   AH = 41h
   DS:DX -> ASCIZ filename (no wildcards, but see below)
   CL = attribute mask for deletion (server call only, see below)

Return: CF clear if successful
       AX destroyed (DOS 3.3) AL seems to be drive of deleted file
   CF set on error
       AX = error code (02h,03h,05h) (see AH=59h)

Notes: (DOS 3.1+) wildcards are allowed if invoked via AX=5D00h, in which case
     the filespec must be canonical (as returned by AH=60h), and only
     files matching the attribute mask in CL are deleted
   DR-DOS 5.0-6.0 returns error code 03h if invoked via AX=5D00h
   DOS does not erase the file's data; it merely becomes inaccessible
     because the FAT chain for the file is cleared
   deleting a file which is currently open may lead to filesystem
     corruption.  Unless SHARE is loaded, DOS does not close the handles
     referencing the deleted file, thus allowing writes to a nonexistant
     file.
   under DRDOS and DR Multiuser DOS, this function will fail if the file
     is currently open
   under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
BUG:   DR-DOS 3.41 crashes if called via AX=5D00h

See Also: AH=13h,AX=4301h,AX=4380h,AX=5D00h,AH=60h,AX=F244h,INT 2F/AX=1113h