Instructions for changing the root folder under windows specifies running this script: updateip.exe --base_directory "C:\Program Files\BitNami WordPress Stack" --appurl /
However that yields the message: There has been an error. Error reading INI file C:\Program Files\BitNami WordPress Stack\properties.ini
Sure enough, using a standard install (entirely clean) that directory doesn't exist. I might try to hack around but I'm not sure which line that's failing on, or even which properties.ini file it refers to, so somewhat worried that I'll break something.