More seriously, this was kind of expected with a new OS and it's not the first time RIM has been careless with file permissions on their tablets. (berryreview.com)
NRT allows you to easily backup and restore data, flash additional zip files, set file permissions, install apps, generate logcats, and much more. (androidauthority.com)
If the simple permissions prompt shown above doesn't work (or you don't even get the prompt, but an access error instead), check out our primer on Windows file permissions to learn how to manually edit the permissions and get to your files. (howtogeek.com)