Hi Julio, your Office VBA code can use XMLHTTP to retrieve and read a file in the background. Example: https://stackoverflow.com/questions/36221544/excel-vba-open-url-without-opening-browser

Is there a reason you need to use Firefox in particular? On Windows the typical path is either:

• "C:\Program Files\Mozilla Firefox\firefox.exe"
• "C:\Program Files (x86)\Mozilla Firefox\firefox.exe"

Your code can determine which file exists and use the one it finds. There might also be a Registry key, but I haven't looked.

Thank You very much for your answer but my question is related to the default carpet in which Firefox downloads files from the net, not the carpet where the browser is installed. On the other hand, I created an "imaginary" carpet , declared it as the default download carpet of Firefox and I didn't found it in the Windows registry, so, I suppose that the adress of that carpet is not stored in the registry.

By default, Firefox stores the last used download folder on a per-site basis, in a SQLite database. This will be difficult for your app to discover. I think you will need the user to save files needed by your application in a particular folder such as the default Windows download folder.

You can also look at wget.

• https://en.wikipedia.org/wiki/Wget