If you wish to create a document that has nothing after the period (no file type) under Windows platform call MAP FILE TYPES and create a fictitious type (e.g. "NULL") and associate it with three spaces for its file type extension.

For example:

MAP FILE TYPES ("NULL";" ";"documents with no extension")

Once the call has been made, the commands Append document, Create document,
Create resource file, and Open resource file while running on Windows can utilize
the new, extensionless file type.