Quote Originally Posted by bhxtyrant
but for some reason the thumbnail icons still do not display correctly (files set to open in media player still have quicktime and realplayer icons)
Open Windows Explorer and go to Tools > Folder Options. On the File Types tab scroll down the menu and highlight the relevant extension.Click the Advanced button and then click the Change Icon button. Highlight the media player icon or browse for it,then click OK,OK,Apply.

Repeat the process for each extension icon you want to change.