OS X has stratified permissions in accessing files.
Files coming from under old operating systems don't have their permissions set correctly.
Do a Command-"I" to see the information on the file - as attached below.
As administrator you can give yourself, as a mere user, permission to view and alter the file.
BTW: You can read about this in OS X manuals and run around as SUPERUSER with permission to do anything, including inadvertently messing things up. So be careful.
Dwight Atkinson