You are unable to 'edit online' a MS Office document whose path length is greater than 255 characters.
I know this MAX_PATH limitation is associated with the Windows file re-director, however, could you see if we can workaround the issue on Alfresco side?
Steps to Reproduce:
1. In a site's doclib, create a folder and its sub-folders so that the path length to the end MS Office document (e.g. a word file) is longer than 255 characters.
2. Click 'edit online' of the word document created above.
Users should be able to edit the word document online.
It displays attached warning message and doesn't open the word document for editing.