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Summary
Name	Adobe Portable Document Catalog Index File
Version	3.0
Other names
Identifiers	PUID: fmt/447
Family
Classification
Disclosure
Description	Adobe Portable Document Catalog Index File (PDX) is the format of a file created when an index is built for a collection of PDF documents defined as a catalog in Adobe Acrobat Pro versions 2.0 and later, allowing users to search through the contents of the catalogue.
Orientation
Byte order
Related file formats	None.
Technical Environment
Released
Supported until
Format Risk
Developed by	None.
Supported by	None.
Source	Digital Preservation Department / The National Archives
Source date	28 Aug 2012
Source description	PDX is Adobe Acrobat Catalog Index file, available in Adobe Acrobat versions 2 and later. When created, a PDF Catalog Index will also create a number of dependent sub-files of specific filetypes. The extensions for these filetypes within earlier versions of .pdx are .wld, .abt, .did, .ddd, .pdd, .plc, .cat, .trn. In later versions only .idx files are created.; The Catalog Index creates a fully text-searchable relationship between the indexed pdf files.; 04/2024 (v.118): Description and links added as part of PRONOM Research Week 2023. Archives nationales (French National Archives).
Last updated	17 Apr 2024
Note	https://helpx.adobe.com/acrobat/using/creating-pdf-indexes.html