Added in sample plugin and tested things out. Works.

src/main.c

@@ -139,13 +139,17 @@ init_lua:
   lua_pushstring(L, exename);
   lua_setglobal(L, "EXEFILE");
 
-#ifdef __APPLE__
   lua_pushboolean(L, true);
+#ifdef __APPLE__
   lua_setglobal(L, "MACOS");
   enable_momentum_scroll();
   #ifdef MACOS_USE_BUNDLE
     set_macos_bundle_resources(L);
   #endif
+#elsif _WIN32
+  lua_setglobal(L, "WINDOWS");
+#else
+  lua_setglobal(L, "LINUX");
 #endif
 
   const char *init_lite_code = \