what is prf.tmp and how to delete it safely?

Recently I created roaming profile for a user so that we can change the computer. While saving all data from local computer to destination location, outlook crated 4 temporary files named prf4.tmp, prf5.tmp, prf7.tmp, prf79A.tmp. The first 3 are more than 8 GB and last one is 200 MB. In some furoms it said that they are generally safe to delete but cannot get required answer.
Sachin TandukarITS Team LeaderAsked:
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