0Hello Dmitri, 02br 02br 00If the conversation involved several formats, we might well say 'the PDF format', but normally, since it is a proper name (Adobe Acrobat's 'Portable Document Format'), then we would expect no article. (Not to say that there are no proper nouns that take 'the', since the usage is somewhat idiomatic). Usage here may be in the process of development, as IT is still a relatively new field.
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