Weird? Yes. Surprisingly common? Also yes. My bank is the exact same way - cannot deposit checks via their website. Must be in person or use their mobile app. It’s really irritating.

I’ve had no luck trying to get any semi-modern version FileMaker to run in WINE so far. I too came across that same win-apps solution recently. It looks promising, but I haven’t had a chance to build the underlying vm yet. Please dm me if you learn anything useful!

I rarely if ever see ZeroTier mentioned as a solution, but it’s a self-hostable encrypted virtual mesh network (with a small free tier for corp-hosted), super secure, and really easy to setup. I use ZTnet instead of the free-tier corp-hosted controller