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I can't open a file I created. Either n ot a supported file or type or file has been damaged

New Here ,
Aug 19, 2021 Aug 19, 2021

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I've created multiple files using my copy of acrobat 9 pro. Suddenly, I'm getting errors that read: Acrobat could not open *.pdf because it is either not a supported file type or because the file has been damaged.

I have multiple files giving this same result. I find it difficult to believe that all my files are damaged ?

The only difference is they were created when I was using win7 and I've since upgraded to 10 

I'd be grateful for assistance, as I can't re-create any of these documents. I attached an image of the error message.

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Adobe Community Professional ,
Aug 19, 2021 Aug 19, 2021

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Can you share one of the files?

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New Here ,
Aug 20, 2021 Aug 20, 2021

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 I'd be happy too.

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Adobe Community Professional ,
Aug 20, 2021 Aug 20, 2021

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Open the file in a plain-text editor (like Notepad). What's the first line you see there?

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New Here ,
Aug 20, 2021 Aug 20, 2021

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Just scrambled code "globs"

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Adobe Community Professional ,
Aug 21, 2021 Aug 21, 2021

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If it doesn't start like this:

%PDF-1.7

(the number can change, but the text has to be that)

then it's not a PDF file.

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