Downloading 3D files

Hi,

I have WinSCP with many 3D .stp files on it. Normally when I put URL of a specific 3D file in my webbrowser I can download the according 3D file. But for some reason some of these files open in webbrowser in a text type format instead of downloading as a .stp like it should.

I added a screenshot of the text that appears in my webbrowser when I attempt to download a file through the URL address.

Does anyone know what causes this?

This does not look like a WinSCP question.
It's rather a question about your webserver configuration.
Please contact the server administrator/hosting support.
Note that you do not have the file on "WinSCP". You have then on your server (which you are connecting to with WinSCP).