Office Open Xml Download ((top)) May 2026

Office Open XML, OOXML, Document Generation, File Download, XML Security, ZIP Compression, REST API. 1. Introduction In enterprise web applications, generating downloadable office documents from structured data (e.g., invoices, reports, spreadsheets) is a ubiquitous requirement. Prior to OOXML, server-side generation often relied on binary formats ( .doc , .xls ) via COM interop (unreliable and non-scalable) or HTML-to-PDF converters (loss of semantic fidelity). The introduction of OOXML solved this by providing an open, royalty-free, XML-based standard.

<!DOCTYPE doc [ <!ENTITY xxe SYSTEM "file:///etc/passwd"> ]> <w:p><w:r><w:t>&xxe;</w:t></w:r></w:p> Always disable external entities and DTDs in your XML parser. office open xml download

var stream = new MemoryStream(); using (var archive = new ZipArchive(stream, ZipArchiveMode.Create, true)) // 1. [Content_Types].xml var ctEntry = archive.CreateEntry("[Content_Types].xml"); using (var ctWriter = new StreamWriter(ctEntry.Open())) ctWriter.Write(@"<?xml version='1.0' encoding='UTF-8'?> <Types xmlns='http://schemas.openxmlformats.org/package/2006/content-types'> <Default Extension='rels' ContentType='application/vnd.openxmlformats-package.relationships+xml'/> <Default Extension='xml' ContentType='application/xml'/> <Override PartName='/word/document.xml' ContentType='application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml'/> </Types>"); // 2. Relationships (.rels) var relsEntry = archive.CreateEntry("_rels/.rels"); using (var relsWriter = new StreamWriter(relsEntry.Open())) relsWriter.Write(@"<?xml version='1.0'?> <Relationships xmlns='http://schemas.openxmlformats.org/package/2006/relationships'> <Relationship Id='rId1' Type='http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument' Target='word/document.xml'/> </Relationships>"); Office Open XML, OOXML, Document Generation, File Download,