Location of jar download

Hi guys,
I assume this question is browser specific but can someone tell the file path where jar files are downloaded to?
Many thanks,
Alex

I will explain my problem in more detail.
We have a .msi file (a bunch of dll's) which contains our API. The API is a set of c++ COM interfaces. I need to use java to demo the API but... the demo must be embedded in a browser (that is why im using java).
The solution I came up with was to have the COM bridge, the application files and the API msi packaged in a downloadable jar. The user would then download the jar file, the app would unpack the msi and run it and then the app would call the API methods.
Therefore, I need a way of downloading the jar, extracting the msi and running it before I can use any of my API methods.
I hope my explanation is clear, I can provide you with more info if needs be.
Thanks for your help.

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