I just did (again) a full uninstall/install.
Installed just one mod (Animations) and the game started.
Here's the APP.log:
[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 970/PCIe/SSE2 4.5.0 NVIDIA 376.33
[00000000] INFO: OpenGL 2.0 support detected
[00000000] INFO: Using PBO
[00000000] INFO: Found swap_control extension
[00000000] INFO: Max texture size: 16384x16384
[00000000] INFO: Original resolution 640x480, window size 1920x1080, output resolution 1440x1080, internal resolution 3840x2160
[00000000] INFO: Shader limits: varying 124, vert uniform 4096, frag uniform 4096
[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...
[00000001] creating dsound primary buffer
[00000001] reading audio file
[00000001] loading static sounds
[00000001] sound initialized
[00000001] set music volume: 127
[00000001] set music volume: 127
[00000001] Entering MAIN
[00000001] Exiting MAIN
[00000001] START OF CREDITS!!!
[00000001] INFO: D:\Programmi\Steam\steamapps\common\FINAL FANTASY VII\data\movies\eidoslogo.avi; vp8/vorbis 1280x960, 30.000000 FPS, duration: 11.133000, frames: 334
[00000279] set music volume trans: 127->0, step=60
[00000334] INFO: D:\Programmi\Steam\steamapps\common\FINAL FANTASY VII\data\movies\sqlogo.avi; vp8/vorbis 1280x896, 15.000000 FPS, duration: 14.533000, frames: 218
[00000344] END OF CREDITS!!!
[00000344] Entering MAIN
[00000344] set music volume: 127
[00000344] Exiting MAIN
[00000344] START OF MENU SYSTEM!!!
[00001466] WM_CLOSE
[00001466] END OF MENU SYSTEM!!!
[00001466] Field Quit
[00001466] UNINITIALIZE DD
I'll try to install some more mods and I'll keep you updated.