When utilising the File Browse item type in 19.2, I was looking to limit the restriction to CSV and Excel documents.
I would think the following set of 'File Types' should apply
text/csv,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

However, this seems to ignore the text/csv mime type - I only have .xlsx documents listed.
If I combine other formats, it works fine, for instance
image/png,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Even when using just text/csv, it does not seem to honour the file type. Instead, all files are shown (*.*).
Am I doing something wrong?