[求助] excel文件崩溃了

放在google drive里面，经常使用经常更新的一个文件，昨天关闭后再打开就出现：

Excel cannot open this file.
The file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file.
试了好多方法都没法恢复，请牛人指点下，先谢谢了