File Content Extraction 26.1
Filter SDK .NET Programming Guide

# Extract Subfiles from PDF Files

File Content Extraction can extract document-level and page-level attachments from a PDF document. Document-level attachments are added by using the Attach A File tool, and can include links to or from the parent document or to other file attachments. Page-level attachments are added as comments by using various tools. Page-level or comment attachments display the File Attachment icon or the Speaker icon on the page where they are located. File Content Extraction can also extract the files from Portfolio PDFs.

When a PDF’s attachments are extracted to disk, the attachments are saved in their native format.

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Version 26.1 | Last updated January 2026

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Product: File Content Extraction 26.1

Topic Title: Extract Subfiles from PDF Files