Open Packaging Conventions

The Open Packaging Conventions (OPC) is a container-file technology initially created by Microsoft to store a combination of XML and non-XML files that together form a single entity such as an Open XML Paper Specification (OpenXPS) document. OPC-based file formats combine the advantages of leaving the independent file entities embedded in the document intact and resulting in much smaller files compared to normal use of XML.

Not to be confused with Open Packaging Format (OPF), an unrelated format that describes the structure of an EPUB file in XML.
Open Packaging Conventions (OPC)
AbbreviationOPC
Native name
Office Open XML File Formats - Open Packaging Conventions
StatusPublished
First publishedDecember 7, 2006 (2006-12-07)
Latest versionISO/IEC 29500-2:2021
August 2021 (2021-08)
OrganizationMicrosoft, Ecma, ISO/IEC
Base standardsECMA-376, ISO/IEC 29500-2
Related standardsXML, ZIP
DomainElectronic documents
WebsiteECMA-376,
ISO/IEC 29500-2:2012
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