getUserCacheDir

Returns a base directory in which to store non-essential, cached data specific to particular user.

On UNIX platforms this is determined using the mechanisms described in the

In this case the directory retrieved will be XDG_CACHE_HOME.

On Windows it follows XDG Base Directory Specification if XDG_CACHE_HOME is defined. If XDG_CACHE_HOME is undefined, the directory that serves as a common repository for temporary Internet files is used instead. A typical path is C:\Documents and Settings\username\Local Settings\Temporary Internet Files. See the documentation for FOLDERID_InternetCache.

The return value is cached and modifying it at runtime is not supported, as it’s not thread-safe to modify environment variables at runtime.