Martin, I created a workflow today that will allow the .step file to be checked into the fault in a vaulted state. We use the step file to send to machine shops that require them and generate them when the drawing goes to a released state. If you wanted to upack the step file just check it out and open it with solidworks. There is no need to unpack it inside the vault.
Hope this helps
Seanic Ocean Systems
Can you expand a bit more on the process you are using when you say 'unpacking' a STEP file. In EPDM a file that is 'Saved' into the Vault is automatically added to the vault. But other files that just appear (such as Temporary ~ prefixed files) that you typically wouldn't want to be automatically added to the Vault are not. You can control this however. If you open the Administration Tool and access the User / Settings screen via the Shortcut Menu you should see the section called 'Adding Files' in here you can define file types to add and those to never add.
You can add the 'extensions' for the file formats you want to be added automatically to the vault in here. I have "sld*" to auto add any SolidWorks files created by actions such as Split that wouldn't be a normal 'Save As'. This can be useful if you are 'unzipping' files straight into the Vault as the files in the Zip would not normally be 'Added to the Vault' automatically.
Hope that helps
Solid Solutions Management (UK)