check if file is MS Word or PDF file

[A. Joseph]

What should I look for in a file to determine whether or not it is a
MS Word file or an Excel file or a PDF file, etc., etc.? including Zip
files

I don`t want to check for file extension.
os.path.splitext('Filename.jpg') will produce a tuple of filename and
extension, but some file don`t even have extension and can still be read by
MS Word or NotePad. i want to be 100% sure of the file.
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