Udok, SEH is one of the foundations of Win32. Your C code should be SEH aware. MS STL builds and runs without C++ exceptions. It uses SEH. For example one can build using the /kernel switch and stil use the MS STL. I do not know much about Win32++, I think David is suggesting you call your C code from your Win32++ C++ code. I do not know if it is possible to build using Win32 with C++ exceptions switched off... HTH
rebuilt + added
Visual 2019 solution