How to recover an incorrectly generated file by producer?

Hello everyone,
 
We've been using helix producer for quite a long time by now, and
recently one of the presentations recorded with Helix Producer have
generated an incorrect file.
 
The presentation lasted for about 48min. The generated file has a total
length of about 1:48.
The audio stream starts at 0s and ends at the expected time of around
48min. But the video stream starts at the time of 1h, and ends at the
end time of the file, that is 1:48.
 
Besides reporting the issue, I would like to know what I could do to
repair this video file? Is there any tool that would allow me to shift
the video stream back 1 hour?
 
I tried playing with the rmeditor code, but it seems to me that It's not
possible to do it without access to the source code of rmtools.dll. And
this is not part of the publicly availble code, right?
 
Any suggestions are welcome.
 
Thanks,
 
Anderson Luiz Brunozi