Word XP and later offer an Open And Repair option, which you can use to force Word to attempt a recovery. Just select the file in the Open dialog box and choose Open And Repair from the Open drop-down list in the bottom-right corner. This isn't necessarily foolproof, but it does work on a lot of problematic documents.

Probably this method can't be working, then I would suggest you to use ms word file repair tool on this address https://onlinefile.repair/en/word.html