Please note that only 9.1.0 or later version supports File Cache.
Please follow these steps to recover the file.
1. Launch XMind: ZEN,
2. Enter File > File Cache,
3. Find the file you need and select Retrieve.
If you cannot restore your file there, please send your corrupted XMind file to firstname.lastname@example.org. We will try to fix your XMind file on our side.
Please note that if your file has become 0KB, we can not fix it.