Download oifil400.dll file from the DLL library collection and OCX elements. Perhaps this file will help you to correct the error "the oifil400.dll library is not found" which appears as a result of incorrect operation of the Windows operating system or work with the program. Also, this file may be required when developing software.
How to download free oifil400.dll?
If you are using oifil400.dll, you should review the copyrights to it.