Windows 95

Win95 supported only single CPU, so you may have to take this into account when running games made for it on modern operating systems and hardware. For example games with threading may lock up or crash if they're not limited to single core/CPU due to lack of thread synchronization.

Due to Win95 being largely DOS based operating system in the background, many games advertized as W95 games are actually DOS games (requiring the use of DOSBox or similar emulators), or use programming practices really only suitable for DOS and thus becoming a nightmare to get working on anything modern (a fact mentioned by, for example, GOG.com team about certain unmentioned but possibly indefinitely delayed re-releases).

Backwards compatibility:
* DOS: almost full

DirectX:
* Shipped with DirectX 1.0
* DirectX 8.0a last to support
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