Dialog Box Not Opening

I have a C# window's app that uses the OpenFileDialog from a Linklabel onclick event. When I run it on my PC the dialog box opens, however when other users run it, the dialog box does not open. I'm running Window's 7 Ent Ed 64 bit, the other users are running same OS but 32 bit. The platform in the app is set at x86.

Here's the code:

public string GetFile()

{

string selectedfile;

OpenFileDialog ofd = new OpenFileDialog();

DialogResult dr = ofd.ShowDialog();

if (dr == DialogResult.OK)

{

selectedfile = ofd.FileName;

}

else

{

selectedfile = null;

}

return selectedfile;

}

Has anyone else has this experience?