Need help with Crystal Reports

Hi. I have to modify very little things on a Visual Basic 6 application which uses Crystal Reports. I suspect the problem is a conflict between versions of Crystal Reports, but I really do not know whic Crystal Reports version are these application reports made in. In fact, if I try to open the .rpt it says "unable to open report", even if I try to open it by double-clicking on the .rpt file (outside visual basic). I wonder if someone can help me configure this VB project to work fine inside Visual Basic so I can do these little modifications to the project. The idea is to connect to the virtual machine where I have this project using Teamviewer. I think it should take less than an hour for the right person. Thanks in advance.