Note: This is the first tutorial i have wrote, so any feedback would be welcome.
Step 1: Make sure you have the program you are checking installed and not running.
Step 2: Download and install dotPeek (Free, no signup or trials)
Step 3: Run dotPeek and go to file > open and select your program.
Step 4: Your program will be added to the assembly explorer with .net framework version it requires (if required) or not supported if .net framework is not required.