I'm guess you are using Mac OS. These files are garbage that end up on your card from Copying / Pasting with Finder.
The easiest way to remove them that I know of is to use the terminal.
This is a terminal-related fix, and should be used with caution. (typos could result in losing the wrong files)
Go to Applications > Utilities > Terminal.app
type the following commands, followed by enter after each line.
1. cd /Volumes/[name of your SC memory card]/
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Now you should be in the root of your (micro)SD card.
Type the following
1. ls -al _dstwoplug/
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You should be presented with a list of items, some of which all begin with ._
These are the garbage files, but these aren't the ones bothering you. Now type...
1. rm _dstwoplug/._*
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Cheers,
Jimmy