Google-chrome – How to set a default file extension for a specific download

I'm using chrome web browser and when I download a file it saves the file with .jsp extension.

Everytime I have to change the extension to my desired extension (i.e. .ica).

Just setting the default program didn't help. The file extension need to be changed to work properly.

Is there a way to make chrome save .jsp files as .ica?

Note: The problem din't happen when using IE, it just launches the application automatically. I'd like to have this behavior on chrome as well.

Please, just let me know whether additional information is needed to solve this problem.

Edit:
For now, I changed the settings to prompt every time I download some file, then I have to manually save the file as .ica because chrome wants to save it like .jsp.

I also set chrome to always open .ica file, so when chrome prompts me to save the .jps file, I change it to .ica and then chrome opens the file automatically.

The expected behavior I want is to make it save the .jspfile as .ica file automatically.

Is there some script that could do this?

I have to use this file several times and it is annoying to set its extension every time I want to use it.