I know that, in an open dialog for example, I can view all PDF files by just
filtering using the "pdf" file extension. But that isn't good enough really,
because a file can have the pdf extension without being a true PDF file.
How can I check whether a file is indeed a true PDF file (that can be, for
example, opened in Preview)? Would I be able to filter true PDFs file in an
open dialog, or would I just have to stick to filtering with only the pdf
extension in open dialogs, and later ignore the non-valid PDF files?
Do you have sample code that checks whether a given file is a genuine PDF file?
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