How to make Air Media Player the default media player
To make Air Media Player the default media player, follow the correct instructions for your version of Windows.
Open the settings window and go to the 'File Associations' tab.
Windows Vista, 7, 8 and 8.1
Open the settings window, and go to the 'File Associations' tab. Click 'Set As Default Media Player'. A window, with a list of extensions should pop up. If you want Air Media Player to play all media formats, click the 'Select All' checkbox, otherwise, manually go through the list of formats, and check only the ones that you want Air Media Player to open by default. After you are done choosing the formats to associate with Air Media Player, click 'Save'.