I need to correctly determine the mime type of keynote file and numbers file without relying on the extension. For this purpose, I am hoping to use the magic number concept and match it with the first four bytes of a file.
Link for magic number understanding -> [https://www.outsystems.com/forge/component-overview/10108/validate-file-extension#:~:text=A%20magic%20number%20is%20a,types%20which%20is%20hexadecimal%20format.]
Though after extensive searching online I am unable to find a unique magic number for the above files moreover first four bytes of the file is matching with the magic number of the zip file due to which I am getting the wrong extension as zip. This is the first four bytes 0x50, 0x4B, 0x3, 0x4. Is there any reliable way to find the mime type of these files without relying on an extension?
