SWZ file extension

Adobe Flash Player Flex-signed RSL File

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The .SWZ file extension is used by Adobe Flash Player and is used to store Adobe Flex signed RSL files.

RSL files, called 'Runtime Shared Libraries', are basically standard .SWF files but are part of a shared library and used by multiple applications reducing the overall size of a Flash application.

When an RSL file is signed by Adobe, the file is given the extension .SWZ, meaning they're stored in Adobe Flash Player's cache and can be accessed from a different domain.