Looking at the release notes for 9.3 Patch 2, it suggest it already is supported:
The McAfee DLP Endpoint server software (DLP policy console, DLP Incident Manager, and DLP
Operational Events) is installed in one of the following ePolicy Orchestrator versions.
• ePolicy Orchestrator 4.6.0 and later
• ePolicy Orchestrator 5.0.0 and later
• ePolicy Orchestrator 5.1.0
not yet for ePolicy Orchestrator 5.1.0! you can try it yourself and install The HDLP 9.3.200 extention into 5.1 and see the message
i tried to do update the ProductCompatibilityList.xm, when i install the extention i got
"unable to install the extention . the uploaded file was either corrupt ......"
Have 2 EPO 5.1 here with DLPe 9.3 patch 2 extension and agent in it.
I assume the extension you tried to check in is from DLPE_Package_9_3_200_15_1.zip ?
And the extension md5 hash value is :
FB332AA0D2B63488273160D53E615D44 HDLP_Extension_9_3_200_15.zip ?