Hi,
On https://web.dhan.co/index/portfolio page, there is a download section at the bottom of the portfolio table which is as in screenshot.
Screenshot can tell you that this link could be for downloading the csv file but when you download the file, you would realize it is not a text file nor a csv formatted text file but it is an excel file and opens with MS Excel or spreadsheet software only.
So, please, UI/UX folks – do the needful of correcting the same but I would appreciate if you can also provide csv formatted text file with Company NSE Symbols along in the csv columns.