Use the Site Backup Repackager to reformat a SP2007 site backup (.cmp) for SP2010.
Backup a SharePoint 2007 site and import it into a SharePoint 2010 installation
Browse to your .cmp package. Click buttons to do the following:
- Rpackage the files
When done, you will find the SP2010.cmp package next to your original SP2007 package. Use Powershell to import the SP2010.cmp into a site of the same template type.