File Content Extraction 26.3
Filter SDK C++ Programming Guide

# open

Opens the subfile as a document, which can be passed directly to other FilterSDK interface functions.

NOTE: This method is available only when compiling with C++17 enabled.

## Syntax

    std::pair<std::optional<Document>, SubfileExtractInfo> open() const;

If the subfile is an external link, `std::optional<Document>` is empty, and the `SubfileExtractInfo.external` member is true.

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Version 26.3 | Last updated July 2026

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Product: File Content Extraction 26.3

Topic Title: open