lookup> .u8dsn

.U8DSN·File Extension

U8DSN Other — A .u8dsn file is a U8DSN Other. It is a file format typically read and written by specialized applications.

Othermessage/global-delivery-status

Quick facts

Extension.u8dsn

File typeU8DSN Other

MIME typemessage/global-delivery-status

CategoryOther

Charset—

Compressible—

What is .u8dsn

What is a .u8dsn file?

A .u8dsn file is a U8DSN Other. It is a file format typically read and written by specialized applications.

In the mime-db registry it maps to message/global-delivery-status. When serving .u8dsn over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to message/global-delivery-status — and is delivered over HTTP via the Content-Type header.

How to open .u8dsn files

Use VS Code or xxd to open and edit .u8dsn 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: message/global-delivery-status

Common software that reads/writes .u8dsn:

VS Codexxd7-Zip

Relation chain

.u8dsnextension of

format

U8DSN Otherserved as

mime type

message/global-delivery-statussent via header

http header

Related extensions

Related MIME types

message/global-delivery-status

.u8dsn

Common uses

Application-specific data

How to edit .u8dsn 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 .u8dsn files

Create a new file and save it with the .u8dsn extension, or export this format from VS Code.

Frequently asked questions

What programs can open .u8dsn 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 .u8dsn file?

Create a new file in any text editor or the app that owns the format and save it with the .u8dsn extension.

What is the relationship between .u8dsn and the message/global-delivery-status MIME type?

message/global-delivery-status is the media type identifier used for .u8dsn files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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