Windows 7 XP Mode files lost in upgrade to Windows 10

I finally set aside the time to do my Windows 10 upgrade from Windows 7 at the weekend. 4 hours later it all seemed successful apart from a little glitch (which is now fixed) in terms of the PC not shutting down. However one thing I didn't think in advance about was the XP Mode I used for some old software. Today, I used Hyper V to set up a XP Mode on Windows 10 but can't find all the data and programs that were available in XP Mode on Windows 7. Could I have lost them? I don't have any sort of back up for the data I had on the Windows 7 XP Virtual disk - more fool me. I have found one *.vhd file on the C: drive but this is dated 2009 and so I figure that this is not much use. I can't link it in the Hyper V set-up anyway as it is Read Only and can't be changed, even with Administrator's privileges. Any ideas?

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