Notes about the MT9 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 MT9 file type is primarily associated with 'Music 2.0'. The MT9 technology was first conceived by Electronics and Telecommunications Research Institute (ETRI) and is being shaped into commercial use by venture company Audizen. The format has separate controls on the sound volume for each musical instrument, such as guitar, drum, base and voice and has the ability to package entire albums into a single file. The format is being considered as a replacement for MP3.
Detailed information for file extension MT9:
Primary association: Music 2.0
File classification: Audio
To change file associations press Windows Key
and then Apps and Features
> Default apps
> Choose default apps by file type
Invalid file associations could be the result of underlying issues within your Windows PC.