Thanks Almighty1, I missed the link - all clear now.

What does this mean exactly - what implications will it have for those who have (with heartache) managed to upgrade to the November Update? Will we have to go through the whole upgrade process again...

After upgrading to Windows 10 Pro 'November' release (version 1511, 10586), I found that all my extra printers had disappeared and I had to re-install all of them - this applied to the printers I had...

When Acrobat changes the file associations it will be changing a value in the registry. Therefore it should be possible to find the appropriate place in the registry and manually make the changes....

Unfortunately I am running Acrobat Pro X. In this version it is under Edit/Preferences/General and a large button in the 'Application Start Up' section at the bottom of the dialogue.

Have you tried installing Reader and then go into Acrobat Std and making the default change there instead of in the Reader. This is what I did and have had no problems since. I can open a file in...

OK, when I made the changes in the file associations for Windows 10, it accepted my change but then reverted to Acrobat Reader immediately. However, when I made the change in the preferences/General...

The solution I posted was made on Windows 10 Pro, so your problem may be something different. Are you trying to get the system to recognise a different version of Acrobat Reader? My problem was to...

If you want to make Acrobat your default program for PDF files, you need to bring up Acrobat and go the Edit/Preferences and then select General. At the bottom of the page you will see 'Select...