I was hoping people could help me find this game I played when I was younger (but I'm very doubtful since I've found 4 threads about it on r/tipofmyjoystick, and in none of them did anybody actually find the game).
The game would've been released sometime between the late '90s and 2005, and was 3D (first- or third-person, probably third). I played it on a Windows computer (Windows XP, I'm pretty sure). You started in a house with food nearby. If you walked outside, there was a ride-able horse close by in a paddock, and a bear who would attack you. There was also a beach/shoreline, and if you walked into the water, sharks would attack you. You could travel to other islands on a sailboat.
In terms of those r/tipofmyjoystick threads that already exist on the game,
this one was the best in terms of its overall description (and also how many people replied to it, narrowing down what game it could be).
This one was the best in terms of describing the story: "You play as a man, and you have dialogue scenes with your wife and (maybe) her father, who is building some sort of gliding/flying machine up in a mountain region" (and the title may have had something in it to do with "wing").
This thread mentions there are "castles and a place with tree houses where goblin kinda things live".
This thread mentions "your horse would follow you and swim along (to other islands). there were many islands around with animals you could kill and harvest - even tigers, panthers etc. you could pretty much kill anyone i think. could kill any animal." Also, there was blood when you hit enemies.
Even though there are several other people who remember this game, it's very elusive. It doesn't seem like anyone will be able to find it unless they played it themselves when they were younger and have a great memory. But I can dream.