Search a folder and tag a file in Win 7

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Javascript

Please help in create a javascript that would go into a list of folders and place metadata tags on the file level.

For instance, the script would look into a shared drive and look for a folder titled "Confidential". It then checks in the "Confidential" folder to see if there is a tag attached to the files.

If a tag doesn’t currently exist for a file, then attach a tag called "confidential". If a file already has a tag, then ignore and do nothing.

Needed very urgently.