Howto deactivate the flash sandbox for locally running flash applications?
Create the following directory structure in your Windows profile directory
ApplicationData\Macromedia\Flash Player\\#Security\FlashPlayerTrust
There you can add arbitrary files with the name *.cfg . Flash player will parse them all. Inside one such file you can add multiple pathes, each path name in a new line. Path can point to directories or single SWF files. If a directory name is given the sandbox is disabled for SWF files in the whole subdirectory structure.
As an administrator there is also the possibility to set those pathes for all users of a computer. For more information see Adobe’s flashplayer security manual.