.ICO file type

I installed MSVB sometime back. It has a lot of icons of extension .ICO. But I inadvertently deleted the file type .ICO from the View - File Types menu while playing around. And now I can't view those icons from Explorer anymore. Is there any way to correct this problem and view those icons ? Another question I had was... what software programs can be used to view those icons independently of VB, and to modify them, etc. ?

Thanks.