How to Make Media Player Classic Your Default Player
Media Player Classic, much like iTunes and Windows Media Player, is a multimedia software designed to let you watch videos and listen to music on your Windows PC. If you have more than one media player on your computer but prefer to use Media Player Classic, setting it as your default media player will save you time and effort. Changing your default media player in Windows 7 (the latest edition of Windows and successor to Windows Vista) and older Windows operating systems is easy to do and only takes a few moments.
Open the Start menu on the desktop and click "Default Programs."
Select "Set Your Default Programs."
Find Media Player Classic in the program list on the left side of the window and click it.
Click "Set This Program to Default." Media Player Classic is now your default player for all file types it can open.
Older Versions of Windows
Right-click the file for which you want to set Media Player Classic as the default player.
Click "Open With" and then click "Choose Program ..." on the drop-down menu that appears.
Select Media Player Classic as the default player for that file, and make sure the box labeled "Always use this program to open this kind of file" box is checked.
Click "OK." Media Player Classic is now your default player for this file type. This must be done individually for each file type that you want Media Player Classic to play by default.