That's my first step back.
After that, your backups. As an app developer you know about backups.
I recently made a windows form application in visual studio, but after installing this file it has changed the target type of every single executable on my computer to a different name and now nothing will open apart from chrome, whenever I open task manager through ctrl alt delte the application comes up instead, can someone please help as this has just seriously messed up my computer! cheers!