Infor have recently released hotfix 17 for Smart Office 10.2. This resolves a number of bugs including the issue with JScripts not working on Windows 10 machines :).
The fix doesn't appear to have been back-ported yet to earlier versions of Smart Office - so M3 7.1 customers with Windows 10 are still unable to run JScripts.
Smart Office Hotfix 17 is available via CCSS.