If running the latest version of GW7.0.2HP, you can now both import and export a mime

The token to import a mime is:
"Filename" -- name of the file
"BoxType" one of
"Inbox|" - 6
"Outbox" 7
"Draft" 666
"Personal 198
"FolderName" optional folder name to save it in
"CreateFolder" boolean optional, if true create the folder if not there

The token to save the message as a mime is:

"MessageID" - message to save or 00 for the current one
"Filename" -- where to save it
"FileFormat" one of
"AnsiText" 106
"Mime" 900
"RichText" 899
"WordPerfect60" 269