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A version of this topic also exists for Linux and macOS.
Resource files listed below are only necessary if you intend your application to process PDF files.

File name

Distribution

Bin, Bin64 folders

Image.Format.Jbig2.dll

This file is necessary for PDF export if you are saving pictures into the document using the JBIG2 image codec.

Image.Format.Jpeg.dll

This file is necessary for PDF export if you are saving pictures into the document using the JPEG image codec.

Image.Format.Jpeg2k.dll

This file is necessary for PDF export if you are saving pictures into the document using the JPEG 2000 image codec.

Image.Format.Pdf.dll
PdfTools.Rasterizator.Pdfium.dll
pdfium.dll
PdfTools.PdfToolsAuxInfo.dll

Mandatory for PDF opening.

PdfTools.AdobeSupport.dll
Export.Pdf.dll
PdfTools.Encryption.dll
PdfToolkit.dll
PdfTools.CommonInstruments.dll
PdfTools.Heuristics.dll

Necessary for PDF export.

PdfTools.Crypto.dll

Necessary for the digital signing support.

PdfService.dll

Redistribute this file if your application uses the IEngine::InjectTextLayer method.

OpenTypeSubsetter.dll

Necessary for export to PDF/A format.

TextRendering.dll

Necessary for PDF export.

Data folder

GlyphRecovery0.bin
GlyphRecovery1.bin

Mandatory for PDF opening.

DefaultProfiles.peps

Mandatory for PDF export.

DefaultFont.4.fontdata
DefaultMetricsBoldFont.4.fontdata
DefaultMetricsFont.4.fontdata
DefaultMetricsItalicBoldFont.4.fontdata
DefaultMetricsItalicFont.4.fontdata
DefaultFont.fnt

Mandatory for PDF export.

Data/Resources/CMap folder

Adobe-GB1-2
Adobe-GB1-4
Adobe-CNS1-0
Adobe-CNS1-3
Adobe-Japan1-2
Adobe-Japan1-4
Adobe-Korea1-1
UniGB-UCS2-H
UniGB-UCS2-V
UniCNS-UCS2-H
UniCNS-UCS2-V
UniJIS-UCS2-H
UniJIS-UCS2-V
UniKS-UCS2-H
UniKS-UCS2-V

Mandatory for PDF export.

All the files in this folder that are not explicitly listed here.

Mandatory for PDF opening and export.

See also Distribution Kit