Diablo Backwards Compatibility Guide
#13
Hey community,

Thanks for useful the post, the registry trick is definitely the cleanest solution; unfortunately it didn't work for me at first, because the ID of my Diablo.exe didn't match the one provided by Blizzard.

Here's how to generate the ID of any game:

1. Run Diablo (or whatever game has a palette problem) in Compatibility mode WinXP SP3 (other modes might work, but I tested only this one) and just leave it right away. This will force DirectDraw to generate the ID of your game in a registry key named MostRecentApplication.

2. Find this key by running regeditit and browse your registry to:

For 32bits Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
For 64bits Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\DirectDraw\MostRecentApplication

Note down the value of keys "Name" and "ID" (make sure the Name is your game executable name)

3. The ID needs a little tweaking; let's assume it is 0x12345678. This is a 4-bytes long value, each bytes consisting of 2 hexadecimal digits, so read it as: 12 34 56 78. Because x86/64 CPUs use little endian, you need to reverse the byte order, in this case: 78 56 34 12.

4. Now to force DirectDraw into compatibility mode you need to create/update the key in (replace the final key name "Diablo109" by any name you need, it doesn't really matter):

For 32bits Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\Compatibility\Diablo109
For 64bits Windows: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\DirectDraw\Compatibility\Diablo109

There must be 3 fields there:
- Flags (type: binary) = 00 08 00 00
- ID (type: binary) = the reversed value you obtained in step 3, in this example this would be 78 56 34 12
- Name (type: string) = the name you saw in step 2.

5. Test your game; if it works you should be able to remove any compatibility mode and play just fine!

Hope this helps, peace.

Z

EDIT1: Added reg path for win32bits
EDIT2: Added compat mode requirement to generate ID, and some more info about the registry keys
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Messages In This Thread
RE: Diablo Backwards Compatability Guide - by zebluk - 03-29-2012, 03:02 AM
RE: Diablo Backwards Compatibility Guide - by Ange1Rob0t - 09-07-2013, 09:38 PM
RE: Diablo Backwards Compatibility Guide - by CaptainSassyPants - 02-12-2014, 02:10 AM
RE: Diablo Backwards Compatibility Guide - by VD99 - 03-11-2014, 06:11 AM
RE: Diablo Backwards Compatibility Guide - by GL_ - 06-21-2014, 04:22 PM
RE: Diablo Backwards Compatibility Guide - by GL_ - 06-21-2014, 06:15 PM
RE: Diablo Backwards Compatibility Guide - by GL_ - 06-21-2014, 06:32 PM
RE: Diablo Backwards Compatibility Guide - by MASSSN - 03-15-2015, 07:04 PM

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