Biztalk

Hello there,
I am working with Biztalk and need to do the following. Convert a comma delimited text file to XML. I have done the following:
*Created the inbound document specification
*Created the outbound document specification
*Created the map specification
*Created organizations, Ports & Channels
*Created File receive function

When testing the specifications & map, all is fine. It's formating it correctly to xml and everything, but when I run it through the file receive function, it doesn't convert it at all. It renames it to an .xml file that I've specififed, but it doesn't format the actual data. I get "XML Page cannot be displayed. Cannot view xml input using style sheet. Invalid at the top level of the document. Line 1, Position 1." Then is shows the first record in the flat file.

I am new to Biztalk and xml. I am obviously missing something. If you have any suggestions, please let me know.

Thanks!