Int 21H, AH=41H

2 and higher

“UNLINK” - DELETE FILE

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

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 #01680 at AH=59h/BX=0000h)

(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; DR DOS 3.41 crashes if called via AX=5D00h with wildcards

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 DR DOS 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

AH=13h,AX=4301h,AX=4380h,AX=5D00h,AH=60h,AX=7141h, INT 2F/AX=1113h

Text based on Ralf Brown Interrupt List Release 61