The link RobDog888 gave shows how to use Excel from VB.Net, as do several of the other items in the O.D. FAQs. You don't need Excel to do things, what you need to do is get your VB program to read the data from it and create the the text file.

However, as I said before, this is not the place to post your questions - not only is this forum for a different language you are using, but you are also hijacking somebody elses thread. Instead of replying here, post a new thread in the VB.Net or O.D. forum if you need any more help.