INT 21 - DOS 2+ - "CHMOD" - SET FILE ATTRIBUTES AX = 4301h CX = new file attributes (see #01420) DS:DX -> ASCIZA NUL-terminated ASCII string. The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h. Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. filename Return: CF clear if successful AX destroyed CF set on error AX = error code (01h,02h,03h,05h) (see #01680 at AH=59h) Notes: will not change volume label or directory attribute bits, but will change the other attribute bits of a directory (the directory bit must be cleared to successfully change the other attributes of a directory, but the directory will not be changed to a normal file as a result) MS-DOS 4.01 reportedly closes the file if it is currently open for security reasons, the Novell NetWare execute-only bit can never be cleared; the file must be deleted and recreated under the FlashTek X-32 DOS extender, the filename pointer is in DS:EDX DOS 5.0 SHARE will close the file if it is currently open in sharing- compatibility mode, otherwise a sharing violation critical error is generated if the file is currently open DR DOS 3.41/5.0 will silently ignore attempts to change the 'directory' attribute bit SeeAlso: AX=4300h,AX=4311h,AX=7143h,INT 2F/AX=110Eh Bitfields for file attributes: Bit(s) Description (Table 01420) 7 shareable (Novell NetWare) 7 pending deleted files (Novell DOS, OpenDOS) 6 unused 5 archive 4 directory 3 volume label execute-only (Novell NetWare) 2 system 1 hidden 0 read-only