truerock: That is not an HD version. That is the original 4X3 aspect ratio version distorted by stretching it out. It looks like crap.
mordorxp: The Hell 2 mod offers fullscale HD, from 800 x 600 to 3840 x 2160, plus it supports adjustable framerates, widescreen, borderless window mode, switching from windowed to fullscreen on the fly (alt+enter),
fixes ALL of Diablo 1 bugs that were left there by developers ( you can even check DSF buglist for Diablo 1 on Lurker's Lounge for that ),
plus a megaton of QoL improvements like gold autopickups and additional weaponslots.
Link to it is found here:
https://www.patreon.com/thmod Great input. www.patreon.com/thmod is very interesting.
But, I think I'm seeing similarities to the ...\Diablo\dl file version form GOG.
In Window mode only, you can select various video resolutions.
In fact, I think it may be exactly the same technology.
Am I missing something?
Regardless, this is what I have been posting:
To play the GOG version of Diablo 1 in original 4X3 aspect ratio (on Windows 10 with a 1080p monitor).
1. Use the version in the ...\GOG\Diablo\dl folder
In this folder is another copy of Diablo 1 - but, with some Microsoft DirectX stuff
2. Execute ...\GOG\Diablo\dx\dxcfg.exe and select 1280x1024 Display Mode
3. Set Presentation = Windowed (Fullscreen does not work)
4. Select Save
5. Set the Windows 10 Taskbar settings to "Automatically hide taskbar in desktop mode" = "on"
6. Double click on Diablo.exe to launch the game.
Do not double-click on DiabloLauncher.exe to start the game
Oddly, if you run:
...\GOG\Diablo\dx\dxcfg.exe
and change to 1920x1080
and leave Presentation = Windowed
This gives a 4:3 aspect ratio in full-screen-mode.
If you play around with ...\GOG\Diablo\dx\dxcfg.exe you will
find it provides Diablo in various 4:3 aspect displays in various ways.