This ia an apparent bug in Qt

I can use QFile to create and open files with 4 characters in the extension but when I receive a temp file and try to rename it using 4 characters in the extension the rename fails. If I truncate the extension to 3 character rename works. This of course causes a problem in the client server world where the client still uses the full path name and the server had to truncate the name.

OS: windows 10 Build env: Visual Studio 2017 - Qt5.12.

Bruce