Windows 7 has changed files on two thumb/flash drives to buk extension

Hello.

I have two different thumb drives (two different brands also) that were working fine. And then suddenly I cannot access the files on them - they have been converted to a folder called _MSTBKFS with a whole lot of files with BUK extension. I'm running Windows 7.

Any help to fix these files, and obviously to also prevent it happening again, would be greatly appreciated.

THANKYOU!
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More about windows changed files thumb flash drives extension
  1. It sound of virus/malware infection...

    run cleaning soft (antivirus).... u may need to run rkill first.... (so the cleaning more effective)
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