INT D4 - PC-MOS/386 v5.01 - GET CURRENT PROGRAM NAME
        AH = 1Dh
        BX = task ID (FFFFh for current task) (see AH=19h)
        ES:DI -> buffer for program name (see below)
Return: CF clear if successful
            ES:DI buffer filled
        CF set on error
            AX = error code (see INT 21/AH=59h)
SeeAlso: AH=19h,AH=1Eh

Format of buffer:
Offset  Size    Description
 00h  8 BYTEs   filename
 08h  3 BYTEs   extension

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