Not all files are present in the repo, eg:
Severity Code Description Project File Line Suppression State
Error (active) E1696 cannot open source file "../../SerialNumber/Source/Validate.h" Syser --
Error (active) E1696 cannot open source file "../../SDbgMsg/Source/SDbgMsg.h" Syser --
Tried to build inside MS VS2019, Syser.sln