Groupwise 7, Vista SP1, Lenovo laptop

I have an .GWI file on my desktop. I cannot right-click and get properties on the fiel, I cannot rename the file, and I cannot delete the file. I have read about this elsewhere on the forum, and have rebooted in safe mode and tried to delete the file. Nothing works. And, evertime I try to do any of the three actions on the file, Windows Explorer locks up.

Can anyone tell me how to delete this file, or what if any process has the file locked?

After acquiring the file, my Windows explorer File->New has stopped working, and Explorer freezes whenever I mouse-over the New item in the File menu.