The title explains what I'm trying to do. I've tried this by selecting a file on my synced OneDrive/SharePoint, selecting "Open With", and choosing Teams.exe from the following path: "C:\Users\Admin\AppData\Local\Microsoft\Teams\current\Teams.exe"
Of course it doesn't work. File Explorer will open the "home page" of Teams instead of opening the specific file within Teams. So am I missing something, or does a custom file handler need to be created for this to be an option? Is anyone aware of a third party file handler developed just for this purpose?