[CONNECT Update 15] PGP file

When I open a particular file, I see the message A PGP File is Loaded! (Why is MicroStation surprised — what's that exclamation mark for?)

PGP

It's discussed in MicroStation help.  Help says that it slows the loading of a DGN file.  What help doesn't tell me is how to stop loading the PGP file — I don't use AutoCAD and don't need those AutoCAD abbreviated key-ins.

I'd be thrilled if anyone could tell me why that message has started to appear.