Corrupt preferences won't fix and what are these?

I use a utility called AppleJack as well as one when running called MainMenu. Both keep finding corrupted preferences and I keep fixing them -- but they keep perpetuating and I don't know what is doing it or what they are.
These are the continually corrupting preferences:
com.AtionetworkCorporation.Midbrain.plist
com.FineTech.Thetis.plist
com.Seard.MediaFiber.plist
This is the message in the log window:
Verifying preference files
Wed Jun 6 08:51:18 EDT 2007
/Users/(removed)/Library/Preferences/com.AtionetworkCorporation.Midbrain.plist:
XML parser error:
Unexpected character at line 1
Old-style plist parser error:
Unexpected character '0x0' at line 1
/Users/(removed)/Library/Preferences/com.FineTech.Thetis.plist:
XML parser error:
Unexpected character at line 1
Old-style plist parser error:
Unexpected character '0x0' at line 1
/Users/(removed)/Library/Preferences/com.Seard.MediaFiber.plist:
XML parser error:
Unexpected character at line 1
Old-style plist parser error:
Unexpected character '0x0' at line 1
Wed Jun 6 08:51:29 EDT 2007
Preference files verified

What happens if you navigate to those .plist files in the finder and double click on one. If you have Apple's developer tools installed then it should open in the Property List Editor. If that works then it's probably the application that's at fault and not the file.
In any case, as long as the applications that they belong to are happy then it shouldn't matter. If they keep being recreated that way then it's not corruption, even if they don't strictly conform to the standard plist format.
Message was edited by: chris_R

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