Netscape may open Quatro Pro all by itself for you. Or it may open another Spreadsheet program. These files were written for Quatro Pro 6.0 and higher. They are converted quite well by both Lotus 123 and Microsoft Excel. Each file has a chart with it, so look for that.
If Netscape doesn't do all of this automatically, you will have to configure it.
Hopefully, Netscape will ask you how you want to handle these file types. If this is the case, press "Pick Application", and find your Corel directory. Probably c:/corel.
Drop down into the qpw and or Quatro7 subdirectorie.
If trying to open a .wb? file, select the qpw icon. (qpw.exe)
Click OK and you should be seeing Quatro Pro come up and open your document.
That should set your Netscape permanently to automatically recognize the files.