Hi
You can use the "Default Programs" tool to set these preferences.
Also do a repair for Office 2013 will instantly solve the issue.
It is strongly recommended that you only keep one version of Office in one computer.
Sincerely
Tylor Wang
TechNet Community Support
- Proposed as answer by TylorWangMicrosoft contingent staff, Moderator Monday, September 30, 2013 1:53 AM
- Marked as answer by Tony Chen CHNMicrosoft contingent staff, Moderator Monday, October 07, 2013 1:48 PM