Hi Michael,
the -curr extension was added at some point during a CU update to distinguish the Legacy Connector (-curr) from the DataMart connector..
If you used to have your companies using the Legacy connector in older versions, the reports where all linked to GP by the regular company NAME, which could become a problem when upgrading and all of a sudden your reports can't find the GP companies anymore, because you sticked with the Legacy connector.
Microsoft assumed that everyone was going to use the Datamart (their recommendation), but unfortunately it's not the case..
There are some ways to get around this without having to change all the report definitions.