Well you've got two options over here.
1. Call Symantec and ask for the Dat Viewer tool. With which you can read these policy files which are in Dat format.
2. Import the policy to the SEPM ( Just importing the policy does not affect anything Unless and UNtill you assign this policy to any group.) Just importing and not assigning the policy is as good as having no policy.
Once imported you can Read / Edit these polcies.
Once done with that you can either assign to a test group and check or assign it to the group you want.