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follow the instructions at the bottom of https://github.com/openitg/openitg for starters
if VS tells you to install stuff when you open the solution, install it
install DirectX SDK https://www.microsoft.com/en-us/download/details.aspx?id=6812
install C++ MFC through the Visual Studio installer (may need to "modify" your installation if you've already installed without it)
in the tomcrypt project, search and replace `#define SHA1` with `#define SHA1 SHA1` and `#define SHA256` with `#define SHA256 SHA256` to fix compile errors
clone and build https://github.com/stepmania/ogg and https://github.com/stepmania/vorbis using the latest available static solutions. find the built `.lib` files and replace the 3 existing ones under `openitg/extern/vorbis/vs2015` (may need to remove the `lib` prefix from your built copies)
i had to copy `tomcrypt.lib` and `tommath.lib` from their respective Release-SSE2 folders to corresponding Debug folders at this point. i dunno man
finally, i had to copy the DLLs in `openitg/extern/ffmpeg-build/bin` to `openitg/Program` to get `OpenITG-SSE2.exe` to run. now i'm getting an instant error dialog but it's an OpenITG error dialog and not a Windows error dialog so i consider this a success