Notes about the HGT 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 HGT file type is primarily associated with 'Shuttle Radar Topography Mission Data (SRTM)'. In 2000 the Space Shuttle Endeavor measured the elevation for the world between 56 degrees south and 60 degrees north. Select the region in which you are interested at the USGS site.
Detailed information for file extension HGT:
Primary association: Shuttle Radar Topography Mission Data (SRTM)
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.