VB6 and VB.NET are barely related.

But, ignoring that, almost any app of any complexity in VB6 land will rely on bugs, quirks, and implementation details. (Also, I was never clear if the binary format for editing forms was actually documented somewhere). Someone could implement their own VB6 parser, but it seems like a ton of work for a vanishing market.

All of that said, while typing this, a quick search revealed https://www.radbasic.dev/ , so maybe someone's trying. Well, it's a Kickstarter, so maybe someone just has an idea. Dunno.