Common (Windows): uses WinRT APIs only when FF_HAVE_WINRT is defined

src/common/windows/com.c

@@ -1,6 +1,7 @@
 #include "com.h"
 
-#include <roapi.h>
+#if FF_HAVE_WINRT
+    #include <roapi.h>
 
 static void RoUninitializeWrap(void) {
     RoUninitialize();
@@ -27,6 +28,33 @@ static const char* doInitCom() {
     atexit(RoUninitializeWrap);
     return NULL;
 }
+#else
+    #include <combaseapi.h>
+
+static void CoUninitializeWrap(void) {
+    CoUninitialize();
+}
+
+static const char* doInitCom() {
+    HRESULT res = CoInitializeEx(NULL, COINIT_MULTITHREADED);
+    if (FAILED(res)) {
+        switch (res) {
+            case E_INVALIDARG:
+                return "CoInitializeEx() failed: invalid argument";
+            case E_OUTOFMEMORY:
+                return "CoInitializeEx() failed: out of memory";
+            case RPC_E_CHANGED_MODE:
+                // COM was already initialized with a different concurrency model
+                return NULL;
+            default:
+                return "CoInitializeEx() failed: unknown error";
+        }
+    }
+
+    atexit(CoUninitializeWrap);
+    return NULL;
+}
+#endif
 
 const char* ffInitCom(void) {
     static const char* error = "";