I recently received email files as part of client workpapers which I
have to examine. They are *.pst files, which suggest they're bundled
outlook folder file consisting of emails. They're not that big, about
500k to 500,000k bytes.

I brought one to a folder in my outlook and tried to open it. I get a
message, "Can't open this item. Outlook blocked access to this
potentially unsafe item."

What do I have to do here? Thanks.