To get the original dvdmedia icon back, do the following:
* Go to a 10.7.2 or earlier machine.
* Navigate to the Applications folder in Finder.
* Right-click on the "DVD Player" application and choose "Show Package Contents"
* Navigate to Contents > Resources.
* Copy the DVDMedia.icns file.
* Return to your 10.7.3 machine.
* Navigate again to Applications > DVD Player > (Show Package Contents) Contents > Resources
* Paste the DVDMedia.icns file there (you will need to authenticate with your password).
Then all your dvdmedia files will display the correct icon once again.
Had same problem.
After 10.7.3 update today, for all my .dvdmedia rip folders:
1) icons went to blank pages with a rolled corner
2) when fitzing with the "Opens With" I somehow turned all .dvdmedia bundles into non "doubleclickable-as-an-app-bundle" plain ol' Finder folders.
As to 1)
I'm still working on the missing icon part (happened with the 10.7.3 update ... the DVD Player app is a new one of 5.5 where the old one was 5.4 I'm figuring has something to do with it).
As to 2) I found this great trick to restore the functionality :
kudos ggmt827 at this Macrumors thread
1. Open TextEdit (or some text editor), create a small text file and save it.
2. Right-click on the text file, and choose "Get Info".
3. Under Name & Extension, change the extension to ".dvdmedia". Hit Enter to save this change.
4. Under Open With, the associated program should be showing VLC. Select DVD Player instead, and save that change.
Now all the .dvdmedia folders should be reassociated with DVD Player.
Great tip -- thanks! I thought I was losing my mind. I'll pay it forward.
I don't have access to a 10.7.2 instance, so I took a slightly different approach:
1. I navigated via Finder to /Applications/DVD Player/Contents/Resources
2. I opened up my Time Machine backup.
3. I scrolled back to a date before my 10.7.3 upgrade and restored the DVDMedia.icns file to my desktop.
4. I then dragged that file back into the /Applications/DVD Player/Contents/Resources folder (I had to authenticate to do so)