A fellow of pokerstrategy.fr got the following answer from SnGWiz of a bug problem:
This is a bug in the HM2 export code. When you export more than one file at a time HM2 adds an extra start-of-file element that should not be there.
You have 2 options:
1. Use SW2, which runs inside HM2.
2. Import the original hand history files that were produced by the poker client into SW1.
When will this bug be repared?
Thanks for your answer and regards