FrameMaker shortens PDF file name

Hi,

I have a book with 3 periods in its file name:

123.456.789.012.book (there are other numbers and also some regular letter characters, but this does not matter)

When I save as PDF (with or without Distiller, network or local drive), the PDF file name is shortened to:

123.456.789.pdf

I have FM 18.0.0 on Windows 11.

Can anyone check, if this happens also on Windows 10? And also with older FM versions?

Is this a FrameMaker issue or a Windows 11 issue?

Best regards, Winfried