system
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I can think of one guy that says we have none of those here, so your wait may be long 
Anyway, I think TPE is an engine that turns the underlying malware into a polymorphic version. Maybe if you can identify the underlying trojan it will make more sense.
EDIT:
Here’s a link that may interest you
http://www.awprofessional.com/articles/article.asp?p=366890&seqNum=5&rl=1
MtE was quickly followed by many similar engines, such as TPE (Trident Polymorphic Engine), written by Masouf Khafir in Holland in 1993.
Today, hundreds of polymorphic engines are known. Most of these engines were only used to create a couple of viruses. After a polymorphic decryptor can be detected, using it becomes a disadvantage to virus writers because any new viruses are covered by the same detection. Such detections, however, usually come with the price of several false positives and false negatives. More reliable techniques detect and recognize the virus body itself.
This opens up the possibility for virus writers to use the same polymorphic engine in many different viruses successfully unless such viruses are handled with heuristic or generic detection methods.
