.obj file support

While trying to load a .obj file from the directory it's not working in the Nopcommerce plugin. But it loads properly if upload the file somewhere else & point to the URL from the plugin.

In basic .Net project, the problem overcomed by mapping mime type to startup.cs > Configure:

var provider = new FileExtensionContentTypeProvider();
            provider.Mappings.Add(".obj", "application/octet-stream");
            app.UseStaticFiles(new StaticFileOptions
            {
                ContentTypeProvider = provider
            });

Can anyone please suggest why the .obj file isn't working while pointing from the directory in a plugin?