Can I install version 4.2x software on a verizon 7130e without complications?

I see several posts regarding deleting the vendor.xml file on my laptop in order to install software from another carrier. What exactly is this file used for? What is accomplished by deleting it, and will I need another copy after the upgrade to 4.2?

I would like to upgrade to 4.2 in order to use the media manager software, but am not sure of the impact of using another carrier's 'approved' software on my verizon 7130e.