Notes about the RMH file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The RMH file type is primarily associated with 'Rights-managed HTML File' by Microsoft Corporation. The Windows Rights Management Add-on for Internet Explorer 6 provides a way for users of supported Windows operating systems to view, but not alter, files with restricted permission. Those working on these files are using the text/rmh MIME type instead of application/octect-stream. The IANA, however, has no record of an approval for that MIME type.