Reading Non-CSV and XLS files

How can I read a file that is not CSV or XLS in dash. I have unique files that I want to read before generating a table for plots

What is the extension of the file? This is a question related to python more than Dash, by the way. Dash only cares that you feed it an array of numbers for the x and y parameters.

The files are called opus, they don’t have an extension, I read them with a package called opusFC which I have a python code for reading them, how can I use the code in dash to read uploaded file.