I am using Windows 7 x64, with all Patches.
I create a backup of my Thunderbird Portable, german, 13.0.1.
When restoring to my local "default" profile, which is empty (fresh installation), i get following message:
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Error
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Selected backup file isn't for selected application. Selected application: Mozilla Thunderbird, backup file is from application: .
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OK
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I can reproduce this problem.
Restoring from non-portable to non-portable worked for me on another pc some days ago.