By the way, you didn't mention the OS of the machine with one USB port... So I don't know if you have a base64 decoder handy! Let's suppose Windows... The in

By the way, you didn't mention the OS of the machine with one USB port... So I don't know if you have a base64 decoder handy! Let's suppose Windows... The internet says that `certutil` can decode base64. If your machine doesn't have that tool, try constructing a .eml file and copy/paste the base64 content in as an attachment. OutlookExpress can open that.