James, the syntax to use to say "No records" should be "- {LF:Name="*", Type="m"}" in both the Windows and Web Client.

So say you were searching for a document called "111 Street Way," you could use the syntax:

{LF:Name="111 Street Way", Type="D"} - {LF:Name="*", Type="m"}

This will return only documents, excluding records.

Type="m" is Record

Type="r" is Record Folder

Type="e" is Record Series