win-capture: Fix game capture file integrity test

Fixes the file integrity test when required files are placed in a path
containing non-english character encodings.

Closes jp9000/obs-studio#523

plugins/win-capture/game-capture.c

@@ -381,15 +381,23 @@ static bool check_file_integrity(struct game_capture *gc, const char *file,
 {
 	DWORD error;
 	HANDLE handle;
+	wchar_t *w_file = NULL;
 
 	if (!file || !*file) {
 		warn("Game capture %s not found." STOP_BEING_BAD, name);
 		return false;
 	}
 
-	handle = CreateFileA(file, GENERIC_READ | GENERIC_EXECUTE,
+	if (!os_utf8_to_wcs_ptr(file, 0, &w_file)) {
+		warn("Could not convert file name to wide string");
+		return false;
+	}
+
+	handle = CreateFileW(w_file, GENERIC_READ | GENERIC_EXECUTE,
 			FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
 
+	bfree(w_file);
+
 	if (handle != INVALID_HANDLE_VALUE) {
 		CloseHandle(handle);
 		return true;