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PDF Portfolios - PDF Portfolios Detecton Code Without Reading Whole File
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adammckay  
#1 Posted : Thursday, September 24, 2026 8:23:54 AM(UTC)
adammckay

Rank: Member

Groups: Registered
Joined: 6/22/2022(UTC)
Posts: 11
United States
Location: Pennsylvania
When I open a PDF Portfolio in Acrobat, it is pretty clear from the portfolio menu what these are. Unfortunately, other viewers do not handle them.

In fact, they are not technically a PDF file even though they have the .pdf extension. How can I use PDFium SDK to quickly detect a portfolio without having to read the entire file?
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