VBA/C# (source) for Off-line QR code generator

I am looking for a Corel off-line code generator. I mean, to build it without using a dedicated site to import a picture.

Everything I could find on the issue is very old and none of the links work.

Is it available, in our community (or somewhere else), such a working example?

I tried transforming a code designed for Excel, I did it, but it has some problems in case of long strings, or in case of special character use. In Excel also...

Can somebody point me in the right direction?

Thanks in advance!