Unfortunately, this is an English site, so most of the membership can't read Chinese - which wis what Google Translate says your text is - and as a result, we do not have the font you refer to installed - though "Microsoft JhengHei" is available on my system, and using it shows no problems via either Notepad or C# code.
VB 6 is ancient: it was superseded over 20 years ago! It's native IO functions are even older, and read ANSI data not Unicode: so your file (which is Unicode) won't read correctly as Chinese characters don't exist in the 8 bit ANSI set.
You can get round that: Stream Object (ADO) - ActiveX Data Objects (ADO) | Microsoft Docs
] is Unicode aware, and I suspect that using that will solve your problem.
But a better solution would be to move to a more modern language: you are almost certain to come up against this and other related problems if you continue developing with ancient software!