Default program is an application which is used to open the file associated with file extension by default. The relationship between program and file extension is also called file associations.
You do not need any other software for this task windows has a features installed by default .
You can perform many task here shown in the image
- Set default programs
- Associate a file type or protocol with a program
- Change autoplay settings
- Set program access and computer defaults
You can set any program that will be treated as default for windows I have choose google chrome and click on Ok
You can change file type with any other extension , click on choose program I have choose winrar
You can set all other default options according to your need .