How to open InstallAnywhere Self Extractor file of Flex Builder

Hi,

I have downloaded the InstallAnywhere Self Extractor file of flex builder as a trial version ...but am not able to install it on my system ..as am using windows xp operating system...could anyone please guide me about how to install this file...

it is the file that i downloaded from adobe trials product for flex 3 ....at my system its fully and completely downloaded ...but file type is showing as just file...dont know how to open it ..?

Sanjay.