Changesets or files that belong to a WorkItem

Hi,

I have been looking for a while for a way to get the change sets related to a work item, I think I have that code now but I am not sure how to get the file affected by the change set, I did find some code in the forums that used a method as follows:

IVersionable file =this.scmManager.getFileFromHandle(change.item());

But I couldnt get which class "getFileFromHandle" belongs to?
If you have any other way or know the answer please help, any pointers would be appreciated.

I have this posted in using RTC but I am not sure if it should be there or here sorry for the double post!

Thanks
Jafar