Questions about exporting versions and ...

Hi, I am a user of Aperture 2.

I was exporting versions from my Aperture 2 library since my friend, a window user couldn't read the
Aperture library.(My library is in my external hard disk, a format NTFS)
While exporting versions, I found out that the sizes of versions are almost 2 or 3 times bigger than the masters(original files).
Even the size of the ones' that I didn't retouch nor did anything, got bigger.
Why do they get bigger? Is there any way that I can export the versions without the change of the size?
(Except exporting masters.)

And I found out that using Aperture 2 is very inconvenient since I don't have any mac users around me.
Which means that I cannot open my Aperture library from my friends' computer.
So I'm thinking about switching to Adobe Lightroom. Is there a migrating tool in Lightroom?
Or is there a convenient way to switch?

Thank you!
Best Regards.

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