Outlook 2003 SP3

Hi, I use this Microsoft Common Dialog control to select files in my custom
task form. Works great, but on some other computers, it doesn't work and
throws up an error. How come it works on some computers, and some not. I
had to load Visual Studio on my computer to get the control to work, but
most people aren't going to have Visual Studio on their computer. What am I
missing. Do I need to use another control?

Thanks for your help,
Joel