SiMPLE | Forum

My new machine. Shame that it also lags, must have windows 10 in the front suspension

https://cdn1.bbcode0.com/uploads/2021/3/12/722db0b3b004ba831471d1dcc4235fe2-full.jpg url image

*aiaiaiaiai

https://youtu.be/_dBz4dTZocg

Sorry to hear that Zwarrior I've only pointed out that messing with system files can be dangerous to user's PC, while putting modified DLLs in main game's folder can affect this game, nothing else. This is how programs (and mods) like this work.
Moving on to your problem, maybe this DLL doesn't work well with the game (in your case), so it's worth trying another one, as it was in my case, e.g. D3D8to9 didn't help me but other fix helped.
I've already discussed a similar topic here on the forum, so if you want, I can send you a link to it

Finally... there's a working solution... instead of explaining it, let me just quote the OP.

UCyborg wrote:

Fullscreen mode in Direct3D8 games on Windows 10

So there is this strange bug (might be a feature to allow some Xbox stuff to work, eg. Game bar) with Direct3D8 games on Windows 10 not fullscreening properly. The problem is hardcoded setting in d3d8.dll that forces so called maximized windowed mode. In previous Windows versions, this mode was activated only for certain applications via Windows Application Compatibility Engine's DXMaximizedWindowedMode shim. You can look up which applications are effected with Compatibility Administrator (32-bit), which is part of Windows 10 ADK.

Even if the game looks fullscreen, it's not real fullscreen, the window may just be setup this way that it doesn't have any borders, but the Desktop Window Manager is sill compositing in the background and giving you VSync, whether you want it or not.

Important: Starting with Win10 version 1809 Build 17763 aka. October 2018 update, the exclusive fullscreen functionality has been removed from system d3d8.dll. As of this writing, it's still possible to use d3d8.dll from Build 17134 to get the real fullscreen back, but that could change any time with future builds.

https://www.vogons.org/viewtopic.php?t=47772

Battlefield 1942, as we know, is a DirectX 8.0 game, hence the problem.

First locate your d3d8.dll in C:\Windows\SysWOW64 (backup the file), then right-click it, select Properties, and follow the rest of the guide you can find here -> https://www.windowscentral.com/how-take … windows-10  (in order to gain full control over the file and to be able to replace it).
Now download d3d8.zip
https://www.vogons.org/download/file.php?id=58667
Unpack it and copy d3d8.dll (Build 17134 folder) to C:\Windows\SysWOW64.
That's it, vsync is disabled, enjoy your input-lag free game.

Zwarrior wrote:

www.youtube.com/watch?v=JLjgMfPw9Pg

You clearly have the same problem.