The file should be located in the c:\corel\suite10\programs directory. The c:\corel\suite10\programs would be applicable to what ever program version you are using. For example, if I was using WordPerfect Suite 8 the path would be c:\corel\suite8\programs and the file would be pfit80en.dll. Just remember that it should be in the "programs" sub-directory on whatever drive it was installed to. If it is in any other location, copy it to the "programs" sub-directory.
Hope this helps!