By default, Windows 95/Windows 98 comes configured so that .dll (Dynamic Link Library) files are not shown. Since the npqtplugin.dll file has the .dll extension, it is not shown.
To see .dll files do the following:
1. Choose Options... from the View Menu in the QuickTime 3 folder window.
2. Click the View Tab.
3. Click "Show All Files" in the Hidden Files section.
All files, including npqtplugin.dll, now appear when the folder is opened.