Thanks ErnestoM for the response.
Actually, what I mean is that for example, a user have attached a JPG file and click save to save the InfoPath form. The next time, when the user open the form, the attachment will show the JPG file that he/she attached previous instead of the filename of the file being displayed.
If I am not wrong, you are referring to the following picture that you can set the option "Show file placeholder" or "Specify default file", which is not what I am looking for.