Build 1703 introduced some changes to the way Windows handles Start Menu and File Type Associations. This is regardless of which version of EM you're running.
Here's one article you may want to check out:
Do a search in the advice center (login.ivanti.com) for Windows 10 to see any other issues you may run into with Windows 10 in general.
File Type Associations are not able to be persisted or configured on a per-user basis at this time with 1703. Microsoft introduced a security feature that resets FTAs when they are configured by a 3rd party.