Reading an .ini file with Notepad using Windows 10

I use Irfanview a lot and sometimes I need to view or edit the
i_view.ini file. Using Windows 8 and earlier this was easy. Just open it
with Notepad, make the edits if necessary, save and close it and
everything works fine.

Things are a bit different using Windows 10. Opening the i_view64.ini
file one sees a mass of what look like Chinese characters. Despite the
font being set at Consolas Regular which is the default for Notepad.

Opening the i_view64.ini file created on the Windows 10 machine on a
Windows 8 machine and it's all Chinese
Opening the i_view64.ini file created on the Windows 8 machine on a
Windows 10 machine and it's all ok.

Both computers are using the most recent version of Irfanview (4.51 64
bit). Winver 1709

Can anyone explain this rather strange behaviour? And, even, could
anyone using Irfanview with Windows 10 have a quick look and see whether
you can read the .ini file opened with notepad?