Do NOT attempt to play Battle.Net this way. You risk a ban!
This hack requires you to be running Diablo 2: Lord of Destruction (not classic!) on patch 1.12a.
Connecting to Battle.net will update your client to 1.13 which is incompatible with D2MultiRes at this time.
Download a mod, D2MultiRes.
Diablo 2 Lod Patch Windows 10.7
Simply download the zip file in the root directory of the repository (PlugY v12.00.zip) and extract the files into your Diablo II directory. Then, start the mod by running PlugYRun.exe. If you would like to edit the configuration of the mod, open PlugY.ini in your favorite text editor and save your changes. Description This is the latest official patch for Diablo II: Lord of Destruction. Do not use this patch if you only have Diablo II installed (as it has a separate patch). Patch 1.13c A new Mystery has been revealed! - Adventurers of Sanctuary are hereby warned once again, that a new challenge awaits you. Within Diablo's Bosses, spanning across the world from the ancient Monastery Catacombs to the Throne of Destruction. Diablo ® II: Lord of Destruction ® is being downloaded! If your download didn't start, try again.
Extract it to your game directory, and launch using D2MultiResGame.exe. Once you start a game, there will be a new “resolution” option in the video options menu. Select it, and resolutions above 800×600 will be available.
Diablo 2 Patch For Windows 10
The readme warns that you may get bad graphics glitches in Direct3D mode. I did, myself. Refer to additional screenshots. But when I switched to DirectDraw 2D mode, it worked just fine. You can set this by running D2VidTst.exe. Sadly, DirectDraw 2D disables parallax scrolling and other visual effects.
Lacking Direct3D mode is a pretty big one. But everything else seems fine.
Diablo 2 Lod Patch For Windows 10
Side-screens like inventory retain their original size, but take up half the screen with a tiled background (they originally took up half a 640×480 screen without needing any tiled background).
The HUD keeps its original size, with the life/mana spheres anchored to the corners, and the stamina and potions anchored to the bottom-center. And the map is pixel based.
FMVs run at 640×480, but are hard-letterboxed to a theatrical 2.20:1. This means windowboxing on wide monitors.