Decrypt Windows XP files without cert

I have a client that had to rebuild his PC and went from XP to Windows 7,  however he had encrypted files (Windows Encription) on an USB drive I didn't know about. I don't think he has a backup cert. Is there anyway to recover these files? I have the USB drive with me.
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CdwalterAsked:
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☠ MASQ ☠Commented:
Unlikely, the EFS Public and Private Keys would have been stored in the XP filesystem.  Even though they know their public key without the pair the files cannot be decrypted.
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CdwalterAuthor Commented:
I was afraid of that, you confirmed everything else I have been reading.
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CdwalterAuthor Commented:
No solution, just confirmed what I already thought
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