This is probably a Windows 10 issue...
I have both DS 8.0 and DS 8.1 installed.
When I double click on a .sch file, Win 10 attempts to open it with DS 8.0.
This is incorrect. DS 8.0 complains it cannot open the file - it requires DS 8.1.
I've tried to change the file association in the file properties to open using DS 8.1 but it still opens using DS 8.0.
How can I fix this?