.AppleDouble File and Directory?

I have connected my new iMac to an existing PC dominated network and Share (NAS) drive. It is Western Digital World Book Network Share Drive. As I started to look through the directoies I now see .AppleDouble files in nearly every directory on the drive. Can somebody tell me if I should be worried about this? Is this normal? Will this prevent me from doing any file sharing or copying in the future? I should add that I see these .AppleDouble files when I view them on my PC. I don't see them when I view them on my iMac. (unless there is a "hidden file display" option that I have yet to discover for iMac

Nothing to worry about.

Open terminal and enter
defaults write com.apple.desktopservices DSDontWriteNetworkStores true
<press enter>

This will inhibit the creation of .DS_Store and .AppeDouble files from being created on network drives

Thank you mrplow!