INT 16 U - PC Tools v5.1-8.0 DESKTOP - POP UP FILE SELECTION MENU
        AX = FFE5h
        DS:SI -> ASCIZ wildcard filespec followed by ASCIZ menu title
        DX = segment of window parameters???
Return: AX = DOS file handle for file
                DS:DX -> filename???
           = FFFFh if cancelled by user
Note:   available only when popped up
SeeAlso: AX=FFDAh

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