Cannot attach log file to suspected commercial usage form

Hi,

I am playing games on my brother's computer, and recently started to get the "suspected commercial use" message. Tried to fill in the relevant form, but cannot attach the log file (I am using a Mac). In Windows its easy, click on "choose file", then get to the log file via Program Files, double klick it and it will be attached. Doesn't work for me on the Mac, when I go to Team Viewer and klick it to open it to get to the log files, it will immediately attach the whole application.zip file.

Help would be much appreciated, thanks!