What is the EDM file format?
.edm files are Adobe Dreamweaver Extension Data Markup Language files - XML-based configuration files used to define custom server behaviors within Adobe Dreamweaver. The .edm extension is the less common variant of .edml; both extensions are functionally identical. The .edm form appears primarily in older Macromedia and Dreamweaver MX-era extensions.
An .edm file contains a root <edml> XML element with child declarations: searchPattern directives that locate runtime code blocks within existing documents, and applyBehavior directives that insert code snippets into pages. Participant .edm files coordinate server behaviors that span multiple files.
The format was introduced with Dreamweaver MX in 2002 and remained functionally unchanged through Dreamweaver CS6 (2012). Extensions are distributed as .mxp (legacy package) or .zxp (Creative Cloud package) archives, which may bundle multiple .edm or .edml files alongside JavaScript and HTML assets.
Because .edm files are plain XML, they can be opened in any text editor. The Dreamweaver extension ecosystem became largely inactive as the web development tooling landscape shifted; few new .edm files are created today.
Security & safety
RISK: LOWPlain XML text file; cannot execute code. Safe to open in any text editor.
Format details
in a nutshell- Electronic Dance Music playlist/project file - Some DJ/DAW applications use .edm for project or playlist data; unrelated to Adobe.
Programs that open EDM files
Windows3 apps
Adobe Dreamweaver
Paid EDM files are used internally; open Dreamweaver's Extension Manager to install extension packages. To inspect the XML directly, right-click → Open with → Notepad. 
Notepad (Windows built-in)
Built-in Right-click the file → Open with → Notepad. Full XML content is readable as plain text. 
macOS2 apps
Technical details
deep spec| Developer | Adobe Systems (originally Macromedia) |
| File type | XML-based plain-text configuration file |
| MIME type | text/xml |
| Encoding | UTF-8 (XML encoding declaration) |
| Root XML element | <edml> |
| Key child elements | searchPattern (locates runtime code in documents), applyBehavior (inserts code snippets into pages), participant declarations |
| Typical file size | 1 KB - 50 KB |
| Introduced | Dreamweaver MX, 2002 (Macromedia) |
| Distribution package | Bundled inside .mxp (legacy extension package) or .zxp (Creative Cloud extension package) archives |
| Platform | Windows, macOS |
| Relationship to .edml | Functionally identical; .edm is the older Macromedia/MX-era variant of the .edml extension |
| Current status | Legacy - Dreamweaver CC retains support but extension development largely ceased post-2015 |
| Released | 2002 (Dreamweaver MX) |
| Latest version | Used through Dreamweaver CS6 (2012); CC versions retain legacy support |
| Specification | helpx.adobe.com |
Community Q&A
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