Sorry, no, extension parameter is not the one to change. Its a separate step. A file extension just tells the operating system what application to open the file with, each file can be of different formats. PDF file format is different to CSV, which is different to actual Office files, etc. You need to actually change the file you have to the file you want using SAS statements. I would suggest to learn about the system you are using before jumping into end processes.
I give you the basic step here:
data _null_;
infile "<yourfile>.txt";
file "<processed>.csv";
put(tranwrd(_infile_,' ',','));
run;
Which would run before you get onto your email step.
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