I don't know how to find it. I don't know how your system is set up. To install it with wine, either navigate to it with Nautilus, right-click on it and select "Open with wine", or navigate to that folder in a terminal, and enter "wine filename", where filename is the name of the file. Either should do the job. You may have to download it by right-clicking on the file in Firefox and selecting Save File As, although it should download to the folder you have told Firefox to use for downloads. If the filename is preceded by a '.' for some reason, it will be hidden, and you can press Ctrl-h in Nautilus to show hidden files.
Asus eee-pc 900 w/ 32GB SSD.