Ever get this warning when starting an application?

Something you installed replaced the original with the wrong version. The NT version will most likely cause the error message to appear. The Win95 version 2.31 should eliminate the message. Of course, now there's a Win98 version (also 2.31), but they seem to be interchangeable, so take your pick. Only one copy of this file should exist on your computer (in your Windows\System folder). Use the "Find - Files and Folders" function on the button to seek and delete any others that might be lurking on your hard drive. Actually, you could do that immediately before extracting your new, downloaded version without causing any harm to your PC.

The downloads are self-extracting zip files. Simply download the one
you need and double-click it to automatically extract the ctl3d32.dll file.
The new file will be unzipped to the proper place.

Ctl3d32.dll (95 version)

Ctl3d32.dll (98 version)