Office 2016 opening files from OWA Blocked

[ITGURU]

I'm in the process of upgrading Windows 7 /Office 2010 pcs to Windows 10/Office 2016

Things seems to be going well apart from the following:

 

I can open both .doc and .docx files if I double click on either file type on a network drive (also added as a trusted location).

 

However, if a document is emailed and tried to be opened from within OWA emails, the docx ones will open, but .doc comes up with the typical, check document permissions, make sure sufficient space , open with text recovery ., but I know the file is working.

 

I've tried adding both the full FQDN and the Domain name of the webmail site it is downloading from , to the trusted locations list but with no joy.

 

Anyone else had this and know of a solution?

 

I've also changed in the policy so it's unticked for 'Enable protected view for files originating from the internet' without success.