DIABDAT.MPQ houses thousands of individual files, organized by type:

: Usually in your Diablo install folder: C:\Program Files (x86)\Diablo\DIABDAT.MPQ

You cannot double-click an MPQ file. You need specialized tools. Here are the three best options for Diablo 1 :

. It contains nearly all the game's assets, including graphics, sound effects, music, and level data. Because this file holds the proprietary content owned by Blizzard, modern source ports and browser-based versions of the game require you to provide it yourself to function. DevilutionX Role in Modern Play DevilutionX : This popular open-source re-implementation requires DIABDAT.MPQ