Question about Outlook Express

I am attempting to import Windows Live Mail messages into a new computer, but it refuses to do it! The details are as follows..............

The source is the hard disk from a crashed Acer laptop. The machine is irreparable, and WinXP will not boot in any mode. So I coupled the hard disk to a borrowed laptop running Win 7 Ultimate, and used Ubuntu to find my data on the hard disk from the crashed Acer. I found and copied my data, and using a memory stick transferred them to the destination - my new Asus laptop running Win 7 Home Premium. This was successful, and I can read documents, spreadsheets, etc, using Libre Office. Wonderfull!

I used the same Ubuntu software to locate my email files, and copied them to the memory stick. Looking at the properties on the borrowed Win 7 Ultimate laptop, all seems to be in order - I can see folders, and the files have .eml extensions as expected.

But when I plug the memory stick into the new Asus, and try to import into WLM, it fails, saying either there are no files (there are!) or that they are in use by someone else ( no!) But as I look at the properties now on the memory stick connected to the new Asus, all the files have lost their .eml extensions, and now have new extensions like 00000001, 0000000A, 000000078, etc..... So I guess WLM says no files because they have all lost their .eml extensions.

It may be relevant that the old Acer was running XP Pro, 32 bit, the borrowed Win 7 Ultimate machine is 32 bit, and the new Asus Win 7 Home Prem is 64 bit. Incidentally, I have checked and the default file extension for WLM is .eml (but it is greyed out.)

I really need these old emails, so I will be extremely gratefull if anybody can help me to fix this issue and get the emails transferred.