Using Custom Tables

I've just upgraded to version 5, and the Custom Tables look like they will simplify my rules tremendously.
However, when I try to set up a CSV file as an external table, it complains that the separator I've chosen does not result in a valid table. The drop down has only newline and tab, and I have also tried entering a comma in that field.
My table looks like this: (look for term, folder to put it in, and string for composing the filename)
Search,Folder,Name
Podiatry,Medical,Podiatry
Urology,Medical,Urology
Family Medicine,Medical,Family Medicine
Palo Alto Medical,Medical,PAMF
Sequoia Hospital,Medical,Sequoia

Can you help me to get this to work?
-Chuck
However, when I try to set up a CSV file as an external table, it complains that the separator I've chosen does not result in a valid table. The drop down has only newline and tab, and I have also tried entering a comma in that field.
My table looks like this: (look for term, folder to put it in, and string for composing the filename)
Search,Folder,Name
Podiatry,Medical,Podiatry
Urology,Medical,Urology
Family Medicine,Medical,Family Medicine
Palo Alto Medical,Medical,PAMF
Sequoia Hospital,Medical,Sequoia

Can you help me to get this to work?
-Chuck