Custom xdg protocol handling?

[RowenStipe]

I'm attempting to install a piece of DJ software called Serato DJ Lite for reverse engineering purposes. I can get the software to install and run using sys-wineas the runner. The problem I'm running into is that Serato DJ Lite requires a sign-in token that the application receives from a website using a custom protocol seratodjlite://authorisedcallback&state=[USER_TOKEN_HERE]&flow_params={"entry"%3A"app_djlite"} but xdg doesn't know how to send that information. I've been able to find out how to make a .desktop file and setup xdg to handle the protocol with it, but it only seems to launch a new instance of the program and doesn't properly authorize.

[alairon]

I had a similar issue with a different program. I got around it by launching the bottle's command prompt to start it, then using the start command followed by the app's protocol link.

So in your case, the command should look like:
start seratodjlite://authorisedcallback&state=[USER_TOKEN_HERE]&flow_params={"entry"%3A"app_djlite"}