My friend told me this problem.
That application was built by using FileMaker pro 8.5 many years ago. And there's no problem at all during those period.
But two weeks ago he met by login problem just after updating Windows OS. This problem happened at Windows 7 and 10.
Application start OK, but authorization problem happened when he entered correct login information.
On his asking, I tried to login at different machine which has older version of those OS. But the same result.
This application does not use server and any other internet connection.
Do you have any kind of advice for this? I searched and found one case similar to this, but there's no answer.