lookup> .appcache

.APPCACHE·File Extension

APPCACHE Data & Text — A .appcache file is a APPCACHE Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

Data & Texttext/cache-manifestCompressible

Quick facts

Extension.appcache

File typeAPPCACHE Data & Text

MIME typetext/cache-manifest

CategoryData & Text

Charset—

CompressibleYes

What is .appcache

What is a .appcache file?

A .appcache file is a APPCACHE Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

In the mime-db registry it maps to text/cache-manifest, and it is marked as compressible. When serving .appcache over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to text/cache-manifest — and is delivered over HTTP via the Content-Type header.

How to open .appcache files

Use VS Code or Notepad++ to open and edit .appcache 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: text/cache-manifest

Common software that reads/writes .appcache:

VS CodeNotepad++Sublime Textjq

Relation chain

.appcacheextension of

format

APPCACHE Data & Textserved as

mime type

text/cache-manifestsent via header

http header

Related extensions

Related MIME types

Common uses

Configuration files
Data interchange between systems
API request and response payloads
Logs and data exports

How to edit .appcache 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 .appcache files

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

Frequently asked questions

What programs can open .appcache files?

Common options include VS Code, Notepad++, Sublime Text. You can also open many of these files with built-in viewers or a browser.

How do I create a .appcache file?

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

What is the relationship between .appcache and the text/cache-manifest MIME type?

text/cache-manifest is the media type identifier used for .appcache files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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