Support – Letter Opener for macOS
All the topics, resources, and contact options you need for Letter Opener.
Double-clicking doesn’t open the file in Letter Opener
Set Letter Opener as standard app to open a file-type.
No attachments are shown
The opened winmail.dat file only shows text and no attachments.
Letter Opener can’t open a file
Contact us if a problem with opening files persists.
The application can’t be opened because it may be damaged or incomplete.
How to repair a damaged application
Invalid license code
There might be two different apps installed.