Silk Test Classic does not open automatically when you double-click a .t, .inc, .s, .g.t, .pln, .res, .stp, or .vtp file.
During the install process, Silk Test Classic is associated with these file types. However if these file type associations have been changed after Silk Test Classic setup, these file types may not be opened with Silk Test Classic when double-clicking such a file.
You can either manually associate these file types with Silk Test Classic in Windows, under , or reinstall Silk Test Classic.