Dunno how annoying this question will be, but given how LFS is apparently frozen on the current version for the foreseeable future, is there any chance you'll put together a Tweak app for it? IIRC you'd said you would for this or one of the last versions... a Tweak app and/or something like a standard NASCAR tweak preset for spec racing.
Frankly I'd lost interest in updating it until the new tyres physics came along. However I don't think the devs are allowing tweak apps anymore, so getting my motivation back isn't the biggest problem if I want to respect their wishes, which given my position, I really should.
Yeah I still use VHPA with Windows 10. I thought the instructions for installing the VB6 runtime components covered Windows 10 as well.
I'd love to make a new version of the tool at some point, that is much more generic (ie not so tied to LFS), supports way more vehicle types, and is written in C#. I'd likely need to be out of work for six months again for that project to start! Sadly I didn't get furloughed during the lockdown so I've been kept busy.
It is to help you tune setups by offering numerical analysis to give further insight into the settings and how they combine to influence vehicle handling. The learning curve is a little steep but it's much more powerful than simple staring at lists of parameters and using trial and error. The idea is you can predict the changes you are making so you'll make adjustments much closer to what you want to get in the first iteration, and you'll also be aware of side effects.
You can add vehicles but I'm not sure how to find out accurate numbers for all the cog stuff and driver position stuff. Also don't know how to save the car so it remembers it next time. But it is possible.
LFS used to support exporting data dumps to give me all the information I needed to model a car in VHPA. Scawen added this feature at my request back in 2006 but I forget the key combination to trigger it now. The files format (extension: BIN) is not even listed in the manual: https://en.lfsmanual.net/wiki/File_Formats
I've not tested with the latest versions of LFS to see if that is still present and working for modded vehicles. VHPA will not need updating though until the new tyre physics come out, at which point I would need to update the hardcoded tyre data.
I'm not sure if I'll be doing that when the time comes, it's been so long since I wrote this, I'd need to install a virtual machine just to install an old operating system (XP) necessary to load the ancient version of Visual Studio that lets me program VB6. I'd love to rewrite the program in a more flexible way but really can't see me having the time for that.
Go to File, User Vehicles, Save Vehicle Data. Once saved, press Ctrl-A to bring up the list of vehicles loaded on start-up. From there, find your freshly saved vehicle file and add to the list so it will always be present in VHPA.