File Content Extraction 25.4
Filter SDK .NET Programming Guide

# Package Contents

To get started with the Filter SDK, unzip the package to a directory on your machine.

TIP: The Filter SDK packages for non-Windows platforms store the correct file permissions for the files in the SDK (for example, some files must be executable) . OpenText recommends that you unzip the SDK on the platform where you intend to use it. If you unzip the SDK on Windows and then copy the files to a non-Windows machine, the file permissions might be lost.

The Filter SDK contains:

- All the libraries and executables necessary for extracting text from a wide variety of formats.

- The include files that define the C API. These files can be found in the `include` directory.

- The Java API implemented in the package `com.verity.api.filter` contained in the file `KeyView.jar`.
- The .NET API implemented in the namespace `KeyView.Filter` in the library `filter_dotnet.dll`.
- The C++ API, which can be found in the `cppapi` folder.
- The Python API, which can be found in the `pythonapi` folder.
- Sample programs that demonstrate File Extraction and Filter functionality using the APIs.

- The files necessary to create a custom document reader, and the source for a sample document reader for UTF-8. For more information refer to the section "Develop a Custom Reader" in the Filter SDK C Programming Guide.

  DEPRECATED: The ability to use custom readers is deprecated in File Content Extraction 25.1 and later. This feature is still available for existing implementations, but it might be incompatible with new functionality and might be removed in future. This means that in a future version, File Content Extraction will no longer be able to call new custom readers, or those that have already been developed.

  If you need to process file formats that are not supported out-of-the-box, OpenText recommends that you contact OpenText support.

## Directory Structure

The following table describes the contents of the Filter SDK.

Directory | Description
--- | ---
`PLATFORM\bin` | Contains File Content Extraction libraries, supporting files, readers, and the `formats.ini` configuration file.
`dotnetapi` | Contains the source files for the .NET API.
`dotnetapi\API_reference` | Contains the API reference for the .NET API.
`dotnetapi\sample` | Contains the sample programs for the .NET API.
`cppapi` | Contains the source files for the C++ API.
`cppapi\sample` | Contains the sample programs for the C++ API.
`Guides` | Contains the Filter SDK programming guides.
`include` | Contains the header files required for Filter.
`javaapi\javadoc` | Contains the Javadoc for the Java API.
`javaapi\sample` | Contains the source files and sample programs for the Java API.
`pythonapi` | Contains the Python API.
`Release Notes` | Contains the Release Notes.
`samples\filter` | Contains the source code for the `filter` sample program demonstrating the Filter interface for the C API.
`samples\pdfini` | Contains the initialization file used to extract custom metadata from PDF documents.
`samples\tstxtract` | Contains a C sample program demonstrating the File Extraction interface.
`samples\utf8sr` | Contains the source for the sample document reader for UTF-8 files. You can use this to create your own custom document readers.

Copyright 1997-2025 Open Text
Version 25.4 | Last updated October 2025

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Product: File Content Extraction 25.4

Topic Title: Package Contents