There has been a report at WebmasterWorld that GoogleBot is now able to initiate a LivePerson Web chat with a customer service representative on the other side.
LivePerson is a technology that allows for people to click a bottom on a Web site and it initiates a Web based chat session with a service representative from that Web site.
It is probably recommended to exclude such files in your robot.txt file, so those Web chats do not occur and do not disturb your support staff.
