In order to search a mail store for a specific kind of attachment (specific extension) you will need to use the dtSearch functions built into Harvester. For example, to search a PST for any .DOCX attachments you would use the following syntax:
(Attachments includes “.docx”)
This would export any messages containing .DOCX attachments. The exported messages would be in MSG format.

Let’s Connect at Legalweek!
March 24–27 | New York City
We’re showcasing CrossCopy Enterprise & CrossCopy Mobile—the future of cloud eDiscovery collections.
Book a meeting to see it in action!