I would be grateful if someone can clarify something about using CkZipW::put_OemCodePage property.

According to the documentation it says:

Sets the OEM code page to be used for Unicode filenames. This property defaults to the OEM code page of the computer.

And there is an example provided here:

(Unicode C++) Create Zip with utf-8 Filenames (Unicode filenames)

Here is an extract from the example:

// To zip using utf-8 filenames, set the OemCodePage = 65001
zip.put_OemCodePage(65001);

I have tried creating a ZIP file that has Japanese file names and it appears to be fine, whether this property is specified or not. Does Windows 10 / 11 by-design now cope with UTF-8 at this level?

Put simply, do I need to continue to specify this property when creating my ZIP files?

I asked ChatGPT and it said this concerning Windows 11:

• Default Encoding: Windows 11 uses UTF-16 as the default encoding for text files and strings.
• UTF-8 Support: Windows 11 also supports UTF-8 system-wide, but this is a recent addition and may impact older applications that rely on non-Unicode encodings.

It said the same thing for Windows 10. So this implies that I don’t need to specify this property any more.