Older Word format .doc files are always blocked by Sophos as suspicious.  Use “Save As” to convert this to the newer .docx format to reduce the likelihood of it being blocked.  Depending on the contents of the file this might not work 100% of the time.

1. Click File, Save As
2. Click ‘Browse’ (A) and locate the appropriate folder in which the file should be saved. Alternatively, click a recently used folder to save in that location (B).
3. Use the ‘Save as Type’ drop down menu to select ‘Word Document’.
4. Click ‘Save’

Don't forget to delete the old .doc file when done!