tkdnd and outlook

Hi
How can I copy a Mail direct from outlook to tcl with tkdnd.
If I copy the EMail from outlook to the filesystem and from the filesystem to tcl/tk it works. I get the filename an I can work with the filename in tcl.
But if I copy from outlook to tcl/tk it doesn't work. I don't get any filename.
I found this :
   FileGroupDescriptor - FileContents: These two types are used for transfering a set of files  that  do  not appear physically on disk, like files from compressed folders or Outlook e-mail messages. File names are transfered as in the CF_TEXT type, while file contents  are transfered in binary. Tkdnd retrieves both the file names and the file
contents, and saves then in a temporary directory. When the transfer is complete, the file  names  of the saved files in the temporary folder are returned. Note that tkdnd support this type pair only as drop targets and not as drag sources.
on: https://manpages.ubuntu.com/manpages/noble/man3/tkdnd.3tcl.html
How can I copy the Mail to tcl?
regards
Manfred