rss feed from csv file

I have a php file that is converting data from a daily automated uploaded .txt file and turns it into this rss feed: feed://[login to view URL] The problem is that this php file requires my product to be read from a "csv" formatted file to properly make the conversion. But the problem is that my automated upload can only be exported as a .txt. So right now each day I have to download the .txt file from my ftp, convert it to "csv" and then reupload it. I was hoping that someone would be able to do a little modification to the .php file so that it would be able to read the original .txt file instead and produce the same rss feed. Thanks