Hi,

Can you open the file on SharePoint successfully for the first time?

If the symptom happens when you open the file the second time and you receive the following error message: The path or file name for 'https://server_nameSPSsite/documents/file_name.pot'. is invalid. Please check that the path and file name are correct. I think this hotfix from the article KB949405 can help you.

Let me know if I misunderstand you.