For those having issues starting the game after upgrading to Windows 10 from Windows 7 or 8.x...
I just upgraded to Windows 10 from Windows 8.1 and the game would not initially launch. The APP.log will look like this if so:
[00000000] INFO: FF7/FF8 OpenGL driver version 0.8.1b
[00000000] INFO: Auto-detected version: FF7 1.02 US English
[00000000] INFO: NVIDIA Corporation GeForce GTX 965M/PCIe/SSE2 4.5.0 NVIDIA 353.62
[00000000] INFO: OpenGL 2.0 support detected
[00000000] INFO: Found swap_control extension
[00000000] INFO: Max texture size: 16384x16384
[00000000] INFO: Original resolution 640x480, window size 2880x1620, output resolution 2160x1620, internal resolution 3840x2160
[00000000] INFO: Shader limits: varying 124, vert uniform 4096, frag uniform 2048
[00000000] INFO: FFMpeg movie player plugin loaded
[00000000] INFO: FFMpeg version SVN-r25886, Copyright (c) 2000-2010 Fabrice Bellard, et al.
[00000000] INFO: VGMStream music plugin loaded
[00000000] INFO: Loading external library Multi.dll
[00000000] LOCK UNLOCK TEST
[00000001] MATRIX INITIALIZE
[00000001] INITIALIZE DD/D3D END
[00000001] initializing sound...
To fix this, rerun the 7H Game Converter from STEP 1 and press "O" to Overwrite when asked. This will set the registry keys correctly from FF7Config.