How to open .STEAMSTART file extension?

If you cannot open a new file that has been saved in the .STEAMSTART format you need to download the appropriate software. The manufacturer of .STEAMSTART files is Valve; .STEAMSTART files belong to the Game Files category. After downloading the application from the list available on our website just run an unknown file, and as the default set the newly installed application supporting the .STEAMSTART files. Activities performed in the order described should solve the problems with all the files in the .STEAMSTART format.

• What is .STEAMSTART file?
• How to open .STEAMSTART file?
• What is .STEAMSTART file?