Not sure how many of you are signed up to SNS but got this through last night and I had this issue on an old legacy 5.1.1 Server I'm about to upgrade.
This was resolved when the file updated to the fixed one.
Product extensions are disabled and incorrectly flagged as not compatible in the ePolicy Orchestrator console extensions view
McAfee ePolicy Orchestrator (ePO) 5.x
The following extension(s) are disabled because they are not compatible with this server:
Some product extensions available for download in the Software Manager are incorrectly labeled as not compatible.
An incorrect version of the Product Compatibility List (productcompatibilitylist.xml) was briefly posted on February 20, 2017. The XML file was refreshed on the February 21, 2017 to resolve this issue.
Customers who updated the Product Compatibility List during this window may have been affected.
To check the date of productcompatibilitylist.xml, naviigate to Server Settings, Product Compatibility List, Current Product Compatibility List date. The date should be 12/14/16.