Hi Maarten,
Sorry about the bad steer to Vault Mirror.
On reflection, you might be able to achieve your goal with no addin.
If you can get the search conditions set correctly, the Vault Clients Advanced Search can be quite powerful.
In this example, I am searching for three specific filenames. (Ball Bearing.ipt, Blade.ipt and Battery Connector.ipt.)
I can use the OR operator to create a string like this "Ball Bearing.ipt" OR "Blade.ipt" OR "Battery Connector.ipt"
(If you have a large number of files, you can use Notepad++ to create a macro to quickly process them into a string.)
The problem is that putting this search into the Advanced Find returns more files than I am looking for.
However, if we change the Vault Servers Slop Factor to 0, it will then only give the exact results.

I can imagine its not perfect, especially if you are dealing with 1,000s of files it is a lot of work. But its preferable to writing your own program I guess.
EDITED
I Forgot to add that you can then just select the files right click and choose "Get".
If you find my response solves your question, please click the "Accept Solution" below the response
Richard Rankin
Vault Support Specialist
Global Product Support
Autodesk, Inc.