UNSUPPORTED_MIMETYPE - DFP error

@bvdn wrote:

Checking Hype add in Adwords | HTML% validator:

Zip file contents check
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To see if your .ZIP contains an unsupported file type, try the following:

Open the .ZIP by double-clicking on it.
In the resulting folder, make sure that each file is one of the supported file types: .CSS, .JS, .HTML, .GIF, .PNG, .JPEG and .SVG. If you find one that is not supported, remove it.
To save your updated version, select all of the files in the folder, and click File > Compress items.
If your folder doesn't zip correctly, it might be because you compressed the folder. Make sure to select each item, not the entire folder.
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UNSUPPORTED_MIMETYPE

What can/ should I do?

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