Hi
Just changing the file extention will not change its content, so if it is originally a csv, this won't magically transform it into a pdf.
Are you already using pdfInclude? Did you try downloading the v3.3 from oehive?
As it is a csv, I guess you want to transform the data in the csv file into a pretty looking pdf document with a table containing the data?
There are tools in pdfInclude to help you do that.
Please confirm then I can point you to the right things to use.
regards
JC