When Table Tool is set as the default file opener for CSV documents, it sets a file type name that seems non-standard. Instead, Table Tool could refer to .csv files it can open as "Comma Separated Values (.csv)", more similar to how other apps refer to the file type.
This image is an example list of how many apps refer to files they can open. The last entry is for a CSV openable in Table Tool
When Table Tool is set as the default file opener for CSV documents, it sets a file type name that seems non-standard. Instead, Table Tool could refer to .csv files it can open as "Comma Separated Values (.csv)", more similar to how other apps refer to the file type.
This image is an example list of how many apps refer to files they can open. The last entry is for a CSV openable in Table Tool