What "unprocessable files" means as noted on the traffic page.
Unprocessable Files (Discover) or Unprocessable Components (Data in Motion)
An item is reported as "unprocessable" if, for unknown reasons, the file could not be opened and the content inspected. Files that do not contain text or that cannot be opened for a known reason (such as graphics or password-protected files) are not labeled "unprocessable."
Reasons for "unprocessable" include:
Note: "components" include the individual items that comprise an archive, or compressed file.