Hi Larry,
It may be that your Windows Explorer is not configured to show the file extensions of 'common' file types. Try this : Windows Explorer > Tools > Folder Options > Click on the View Tab. In the 'Folder Options' 'View' Tab window, look for an entry 'Hide extensions for known file types'. Make sure that it is not ticked. If it is, 'Untick' it and then click on 'Apply' and 'OK'.
Now when you use Windows Explorer, you should be able to see the .KAR or .MID file extensions.

To group all the .MID files together and all the .KAR files together, just click on the 'Type' heading in Windows Explorer. You will then see all files with the same extension, grouped together. If you then wish to copy all the .MID files from the CD into another folder on your PC and all the .KAR files to a different folder on your PC, then you can easily block select them by clicking on the First file of the group, move the mouse cursor to the Last file in the group, hold down the Shift key and click on the Last file in the Group. You can then Copy and Paste all the highlighted files from the CD to a new folder on your PC. It is best to create the new folders, before doing the Copy/Paste operation.

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Willum