Added a win32 file chooser to the sdl build for lua loading.. Could someone please test this?

src/drivers/sdl/input.cpp

@@ -152,6 +152,30 @@ std::string GetFilename()
     std::string fname = "";
     #ifdef WIN32
     // TODO: WIN32 file chooser code goes here
+    OPENFILENAME ofn;       // common dialog box structure
+    char szFile[260];       // buffer for file name
+    HWND hwnd;              // owner window
+    HANDLE hf;              // file handle
+
+    // Initialize OPENFILENAME
+    memset(&ofn,0,sizeof(ofn));
+    ofn.lStructSize = sizeof(ofn);
+    ofn.hwndOwner = hwnd;
+    ofn.lpstrFile = szFile;
+    // Set lpstrFile[0] to '\0' so that GetOpenFileName does not 
+    // use the contents of szFile to initialize itself.
+    ofn.lpstrFile[0] = '\0';
+    ofn.nMaxFile = sizeof(szFile);
+    ofn.lpstrFilter = "All\0*.*\0Text\0*.TXT\0Lua Scripts\0*.LUA\0";
+    ofn.nFilterIndex = 1;
+    ofn.lpstrFileTitle = NULL;
+    ofn.nMaxFileTitle = 0;
+    ofn.lpstrInitialDir = NULL;
+    ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
+
+    // Display the Open dialog box. 
+    fname = GetOpenFileName(&ofn);
+
     #else
     FILE *fpipe;