Diablo 1: Diabdatmpq

In the original 1996 release, hard drives were small and expensive. The game executable ( Diablo.exe ) ran locally from your hard drive, but it read the heavy multimedia assets in real-time directly from DIABDAT.MPQ located on the physical game CD. What is Inside the Archive? Diablo · elishacloud/dxwrapper Wiki - GitHub

If you own the physical disc, insert it into your drive. Open the drive directory using your file explorer, locate the file named DIABDAT.MPQ (often in the root folder or a subfolder), and copy it directly to your hard drive. Method 2: The Digital GOG Release