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Standard ECMA-376
Office Open XML File Formats
1st edition (December 2006), 2nd edition (December 2008), 3rd edition (June 2011) and 4th edition (December 2012)
This Standard defines Office Open XML's vocabularies and document representation and packaging. It also specifies requirements for consumers and producers of Office Open XML. An Office Open XML overview is available on the Ecma website.
The following files can be freely downloaded:
| File name | Size (Bytes) | Content |
| ECMA-376 4th edition Part 1 | 43 637 375 | zipped folder |
| ECMA-376 4th edition Part 2 | 1 405 075 | zipped folder |
| ECMA-376 4th edition Part 3 | 767 052 | zipped folder |
| ECMA-376 4th edition Part 4 | 8 370 151 | zipped folder |
| ECMA-376 3rd edition Part 1 | 48 976 050 | zipped folder |
| ECMA-376 3rd edition Part 2 | 1 477 008 | zipped folder |
| ECMA-376 3rd edition Part 3 | 867 321 | zipped folder |
| ECMA-376 3rd edition Part 4 | 9 299 815 | zipped folder |
| ECMA-376 2nd edition Part 1 | 50 410 914 | zipped folder |
| ECMA-376 2nd edition Part 2 | 1 418 169 | zipped folder |
| ECMA-376 2nd edition Part 3 | 807 091 | zipped folder |
| ECMA-376 2nd edition Part 4 | 8 571 966 | zipped folder |
| ECMA-376 1st edition Part 1 | 350 630 | zipped DOCX file |
| ECMA-376 1st edition Part 1 | 1441795 | zipped PDF file |
| ECMA-376 1st edition Part 2 | 341625 | zipped DOCX file with 2 Annexes |
| ECMA-376 1st edition Part 2 | 1286494 | zipped PDF file with 2 Annexes |
| ECMA-376 1st edition Part 3 | 6625515 | zipped DOCX file |
| ECMA-376 1st edition Part 3 | 5930003 | zipped PDF file |
| ECMA-376 1st edition Part 4 | 14509353 | zipped DOCX file with 4 Annexes |
| ECMA-376 1st edition Part 4 | 33175399 | zipped PDF file with 4 Annexes |
| ECMA-376 1st edition Part 5 | 99655 | zipped DOCX file |
| ECMA-376 1st edition Part 5 | 687279 | zipped PDF file |
ECMA-376 4th edition is technically aligned with ISO/IEC 29500.
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