What do you understand by One viewer?

"One viewer" is one of the features of the MindStick's "Data Converter". 

"One Viewer" refers to the "Data Converter" is one place to view data from all kinds of databases and files (XML, .XLS (Excel), HTML and CSV).

Or you can directly go to the "Data Converter" page by clicking the following link: https://www.mindstick.com/products/data-converter