Files left on USB memory stick when removed

I'm totally new to Apple laptops.  Moments ago I put a PowerPoint file on a new (blank) USB memory stick using my PC, and copied the file to my MacBook Air via its USB port.  When I removed the memory stick and plugged it back into my PC, the original PowerPoint file was still there as I expected, but there were also some odd folders and files: e.g., .Spotlight-V100, .Trashes and ._.Trashes.  What are these?  Why are they there?  Do I need them for any reason?

Have a read here http://www.ghacks.net/2009/08/19/spotlight-v100-and-trashes-folders-on-usb-flash -drives/
OSX "needs" them but not in a way that you cannot delete them from your PC.
Stefan

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