When I compiled the files I got an error relating to the __declspec declarations in win3.cpp, on my machine (VS 2005) the syntax is different. The changes are:
__declspec(dllexport) LRESULT CALLBACK PlPlotWndProc (HWND hwnd,UINT message, UINT wParam,LONG lParam)
and Line 86 should have the same change
In runinstall.bat line 10 has a small type it should be:
if EXIST %1 goto copy
Thanks for the great utility!!