INT 16 - PC Tools v5.1+ DESKTOP API - CREATE/OPEN/DELETE FILE
AX = FFD4h
BH = 3Ch create file (with no attributes)
3Dh open file
41h delete file
BL = access mode
00h read only
01h write only
02h read/write
DS:SI -> ASCIZ filename
Return: BX = file handle
0000h on error
Note:   operation is attempted in (in order) the directory from which the
desktop was started/run???, the directory specified with the
filename, X:\PCTOOLS\, and X:\


16FFD4BH3C - PC Tools v5.1+ DESKTOP API - CREATE/OPEN/DELETE FILE