Problem in loading and previewing a customized report

Question

I have a problem here regarding how the report being loaded .. Here is the case: When users customized a report(let's say report1) and save it in certain place(C:\report1.REPX, then they click at Preview button. All i want to do in the preview button function is to loaded the customized report. Can anyone over there provide me with the source code to load the report from1.REPX pls ? Ur help will be appreciated. Thanks in advance.