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Adobe SWC file

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Title: Adobe SWC file  
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Subject: Adobe Flash, CrossBridge, Flare3D, FXG, Swfmill
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Adobe SWC file

Adobe Flash/Flex Component File (SWC)
Flash Component File Icon
Filename extension .swc
Internet media type application/octet-stream
Magic number PK\003\004
Type of format Class Library
Container for ActionScript classes and data
Extended from ZIP

An Adobe SWC file is a package of precompiled Flash symbols and ActionScript code that allows a Flash or Flex developer to distribute classes and assets, or to avoid recompiling symbols and code that will not change.[1] SWC files can be generated by the Flash authoring tool, and by Flex. They are sometimes referred to as class libraries and cannot be directly executed by the Flash Player.


A SWC file is compressed by means of the ZIP archive format. Renaming the extension of a SWC file to "zip" will allow any ZIP-compatible decompression software to show the contents of the file.

An uncompressed SWC file contains at least a catalog.xml file, and a SWF file, usually named "library.swf". It may also contain other files, such as CSS files. The catalog contains a list of the ActionScript classes contained in the library, their dependencies, and modification dates.

Example catalog.xml

This is a simple example of a catalog.xml for a SWC created in Flash CS4 which contains two sounds.



  1. ^ SWC-based Components, at Adobe LiveDocs.
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