Local Shared Objects (LSO) are stored here:
Windows Xp:C:\Documents and Settings\[username]\Application Data\Macromedia\Flash Player\#SharedObjects
C:\Documents and Settings\[username]\Application Data\Macromedia\Flash Player\macromedia.com\support
Windows 7/8/10:C:\Users\[username]\AppData\Roaming\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys
C:\Users\[username]\AppData\Roaming\Macromedia\Flash Player\#SharedObjects
Macintosh OSX:/Users/[username]/Library/Preferences/Macromedia/Flash Player
GNU-Linux:Appdata and Application Data are hidden system folders, you have to set "show hidden files folders and drives" in the folder options menu to see it. I don't use MacOSX or Linux very often so I am not sure if the folders are viewable by default.
Here is a Firefox addon that will give you better control over LSOshttps://addons.mozilla.org/en-US/firefox/addon/betterprivacy/
Here is a batch script that remove the LSOs for you. It works on Windows Xp and Windows 7 and I am sure it will work on Vista. This will delete the entire Macromedia folder where the LSOs are stored, then rebuild it. This removes all the LSOs and tracking directories and only rebuilds the Macromedia system folders.@echo off
cls
color 09
rmdir /s /q %appdata%\Macromedia\"
mkdir "%appdata%\Macromedia\"
mkdir "%appdata%\Macromedia\Flash Player\"
mkdir "%appdata%\Macromedia\Flash Player\#SharedObjects"
mkdir "%appdata%\Macromedia\Flash Player\#Security"
mkdir "%appdata%\Macromedia\Flash Player\#Security\FlashPlayerTrust"
mkdir "%appdata%\Macromedia\Flash Player\macromedia.com\"
mkdir "%appdata%\Macromedia\Flash Player\macromedia.com\support\"
mkdir "%appdata%\Macromedia\Flash Player\macromedia.com\support\flashplayer"
mkdir "%appdata%\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys"
pause
For more information on LSOs, visit these websites:http://epic.org/privacy/cookies/flash.html
http://www.ghacks.net/2007/05/04/flash-cookies-explained/
http://en.wikipedia.org/wiki/Local_Shared_Object