Locally shared objects (LSOs) or "Flash cookies" are how Flash stores information on your computer between sessions; this includes Flash game save files.
From ActionScript 3.0 Developer’s Guide / Files and data / Storing local data / Shared objects:
When... a shared object [is created], Flash Player creates a new directory for the application and domain inside its sandbox. It also creates a *.sol file that stores the SharedObject data. The default location of this file is a subdirectory of the user’s home directory. The following table shows the default locations of this directory:
- Windows 95/98/ME/2000/XP:
C:\Documents and Settings\username\Application Data\Macromedia\Flash Player\#SharedObjects
- Windows Vista/Windows 7:
C:\Users\username\AppData\Roaming\Macromedia\Flash Player\#SharedObjects
- Macintosh OS X:
/Users/username/Library/Preferences/Macromedia/Flash Player/#SharedObjects/web_domain/path_to_application/application_name/object_name.sol
- Linux/Unix:
/home/username/.macromedia/Flash_Player/#SharedObjects/web_domain/path_to_application/application_name/object_name.sol
Below the #SharedObjects directory is a randomly-named directory. Below that is a directory that matches the hostname, then the path to the application, and finally the *.sol file.
In Windows, you can take advantage of Windows environment path variables for an easy-to-copy link for everything but the random bit: %APPDATA%\Macromedia\Flash Player\#SharedObjects\
For most gaming websites, the cookies will be in a subfolder specific to the game within the url folder. In the case of the question, the save would be in: www.wixgames.co.uk\swf\rocketbootsinc.swf\