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Are you willing to share copies of the tool, or least tell us where we can get? Patricia asked: ≪If the extension is properly associated with an app,
that app will _open_ it, but does anything know what produced it?≫ Yes. XyWrite, as you might expect, shows the user everything in the file. However, many apps generate headers which the user never sees by opening the files. This is how Macs, for example, recognize files without extensions. I have a nifty tool which show common file headers. See attached screenshot of a JPEG file with its header revealed. |