Hans Leidekker (@hans) commented about dlls/odbccp32/odbccp32.c:
} lstrcpyW(value, path);
lstrcatW(value, L"\\");
if (path[pathlen-1] != '\\')
lstrcatW(value, L"\\");
`if (pathlen && path[pathlen - 1] != '\') lstrcatW(value, L"\");` to be safe.