Upload file through Windows Form

I am doing a reconciliation process where the user has to upload excel files.
I made an interface in Visual Studio.

Is it possible to link that with the activity Open Application and when I click a button it should give me a dialog box to upload file through Select File


Is it deployed in any server? If it is , you can simply open that URL right?

Can you please confirm whether that is aspx interface?


I am sorry I am very new to this, it is for a school project.
I have attached both the Windows Form and my xaml, could you please check?

Windows Form.zip (59.5 KB)
ReadingExcel copy.zip (48.3 KB)