Office Open Xml 2021 Download May 2026

| Method | Peak Memory (MB) | Time (s) | Max Concurrent Requests | | :--- | :--- | :--- | :--- | | (deprecated) | 1,200 | 62 | 2 (serialized) | | Open XML SDK + DOM | 890 | 28 | 8 | | Open XML SDK + Streaming (our method) | 230 | 22 | 35 |

Set a maximum decompression ratio (e.g., ZipFile.Extract with ExtractEntry limits). For generation, do not decompress untrusted archives. 4.3 Path Traversal in ZIP Entries Evil entries like ../../config/secret.xml inside a ZIP can overwrite files. office open xml download

<!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. | Method | Peak Memory (MB) | Time

report.zip ├── [Content_Types].xml ├── _rels/ │ └── .rels ├── docProps/ │ ├── core.xml │ └── app.xml └── word/ ├── document.xml ├── styles.xml ├── _rels/ │ └── document.xml.rels └── media/ └── image1.png Logically, the file is composed of (XML, binary, image) linked by relationships using Relationship Id attributes. 2.2 Key Standards | Standard | Content | | :--- | :--- | | ECMA-376 1st ed. (2006) | Legacy "transitional" syntax. | | ISO/IEC 29500:2008 | Strict and transitional variants. | | ISO/IEC 29500:2016 | Added support for dynamic charts, accessibility features. | (2006) | Legacy "transitional" syntax

stream.Position = 0; return File(stream, "application/vnd.openxmlformats-officedocument.wordprocessingml.document", "report.docx");

– Write XML directly to the ZIP entry's output stream using a XmlWriter (or equivalent) without retaining the entire tree.

// 3. Main document part - STREAMING XML (no DOM) var docEntry = archive.CreateEntry("word/document.xml"); using (var docStream = docEntry.Open()) using (var xmlWriter = XmlWriter.Create(docStream, new XmlWriterSettings Indent = true )) xmlWriter.WriteStartDocument(); xmlWriter.WriteStartElement("w:document", "http://schemas.openxmlformats.org/wordprocessingml/2006/main"); xmlWriter.WriteStartElement("w:body"); // Title paragraph xmlWriter.WriteStartElement("w:p"); xmlWriter.WriteStartElement("w:r"); xmlWriter.WriteStartElement("w:t"); xmlWriter.WriteString(title); xmlWriter.WriteEndElement(); // t xmlWriter.WriteEndElement(); // r xmlWriter.WriteEndElement(); // p // Content paragraph (sanitized) var safeContent = System.Security.SecurityElement.Escape(content); xmlWriter.WriteStartElement("w:p"); xmlWriter.WriteStartElement("w:r"); xmlWriter.WriteStartElement("w:t"); xmlWriter.WriteString(safeContent); xmlWriter.WriteEndElement(); xmlWriter.WriteEndElement(); xmlWriter.WriteEndElement(); xmlWriter.WriteEndElement(); // body xmlWriter.WriteEndElement(); // document xmlWriter.WriteEndDocument();