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.CMDF·File Extension

CMDF Other — A .cmdf file is a CMDF Other. It is a file format typically read and written by specialized applications.

Otherchemical/x-cmdf

Quick facts

Extension.cmdf
File typeCMDF Other
MIME typechemical/x-cmdf
CategoryOther
Charset—
Compressible—

What is .cmdf

What is a .cmdf file?

A .cmdf file is a CMDF Other. It is a file format typically read and written by specialized applications.

In the mime-db registry it maps to chemical/x-cmdf. When serving .cmdf over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to chemical/x-cmdf — and is delivered over HTTP via the Content-Type header.

How to open .cmdf files

  • Use VS Code or xxd to open and edit .cmdf files.
  • Any text editor (Notepad, VS Code) can inspect the raw content as text.

Developer info

When served over HTTP, responses should set the following header:

Content-Type: chemical/x-cmdf

Common software that reads/writes .cmdf:

VS Codexxd7-Zip

Relation chain

.cmdfextension of
format
CMDF Otherserved as
mime type
chemical/x-cmdfsent via header
http header
Content-Type

Related extensions

.cdx
CDX Other
.cif
CIF Other
.cml
CML Other
.csml
CSML Other

Related MIME types

chemical/x-cmdf
.cmdf

Common uses

  • Application-specific data

How to edit .cmdf files

  • Open the file with VS Code, make your changes and save.
  • Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .cmdf files

  • Create a new file and save it with the .cmdf extension, or export this format from VS Code.

Frequently asked questions

What programs can open .cmdf files?

Common options include VS Code, xxd, 7-Zip. You can also open many of these files with built-in viewers or a browser.

How do I create a .cmdf file?

Create a new file in any text editor or the app that owns the format and save it with the .cmdf extension.

What is the relationship between .cmdf and the chemical/x-cmdf MIME type?

chemical/x-cmdf is the media type identifier used for .cmdf files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

Explore this reference

Related extensions

.cdx
CDX Other
.cif
CIF Other
.cml
CML Other
.csml
CSML Other

Related MIME types

chemical/x-cmdf
.cmdf

Related headers

Content-Type
HTTP header
Accept
HTTP header

Related methods

GET
HTTP method
POST
HTTP method
PUT
HTTP method
PATCH
HTTP method

Related status codes

200
OK
404
Not Found

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About This Tool

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