Notes about the RKT 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 RKT file type is primarily associated with 'RockSim' by Apogee Rockets. RockSim is a computer program that allows you to design any size rocket, and then simulate its flight to see how high, and how fast it will fly.