%PDF - is this ALWAYS at the begining of every pdf file?

We are adding the ability to work with pdf files to our application.  And we need to identify which type of file we have.  Can I be sure that all pdf files start with the same characters? "%PDF"  And the PDF is always capitalized.
I'm pretty sure the answer is yes, but am hoping someone can confirm.
Thanks.

Not necessarily.  While the PDF Reference/ISO 32000-1 does state that the %PDF occur at byte zero of the file, there are many PDFs out there (that Adobe's products will open just fine) where there is some amount of "stuff" that occurs before the %PDF.
So it's up to you whether you wish to support those documents or not.  But they are VERY MUCH a minority.

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    Attachments:
    File Name Changer.png ‏32 KB
    File Name Changer.png ‏32 KB

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