richtx32.ocx file not found

I am using vb 6.0. In one of my programs I use a rich text control. When I loaded the program to make some changes there was an error because the rich textbox was not loaded. It was before though. When I tried to add this component again I got the message that the file could not be found although it is present according to Windows Explorer.
I found somewhere that this control has been labeled unsafe by Microsoft. Does this have something to with it?
Thanks for any help.
Peter Schoots