The background for this is that .mime we can treat as as a custom extension for us since no one else that I know uses it but it is a registered extension.

.eml we usually don't take over so users can save their decrypted mails and then open it with Outlook. .asc and .p7m are too general.

I guess the status should be set to Testing?

This should now work on master, I will write here once this is in the next beta

Tested on gpg4win-5.0.0-beta413 @ win11.

Done:

• openpgp encrypted mail
  • Save encrypted: filetypes offered are correct, filename is .mime
    
  • Save decrypted: filetypes offered are correct, filename and type selection field is .eml
    
• smime encrypted mail
  • Save encrypted: filename is .mime, type selection includes .p7m
    
  • Save decrypted: filetypes offered are correct, filename and type selection field is .eml
    

Issues found:

• openpgp encrypted mail
  • Save encrypted: filename ends in .mime by default, but .eml is selected in the file type selection field
    
• smime encrypted mail
  • Save encrypted: filename ends in .mime by default, but .p7m is selected in the file type selection field
  • File types don't include .mime
    

I can't reproduce your problems. Can you get me the exact test files you used?

Sure:

Notes:

• "Save encrypted" is only "Save" in the UI.
• This is still reproducible in gpg4win-5.0.0-beta476 @ win11