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AX = FF98h DX = byte offset in file of overlay header (see #00619)
Return:
BX = file handle for DESK.OVL file
Desc: Open the DESK.OVL file, seek to the specified offset, read in the overlay header, and seek to the offset specified by the header
Format of PC Tools DESKTOP overlay header: Offset Size Description (Table 00619) 00h 12 BYTEs NUL-padded ASCII overlay filename 0Ch DWORD offset within DESK.OVL file of actual overlay
Category: Resident Utilities - Int 16h - P
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