src/vs/workbench/api/common/extHostUrls.ts/ExtHostUrls/$handleExternalUri
class ExtHostUrls:	$handleExternalUri(handle: number, uri: UriComponents): Promise<void> {
		const handler = this.handlers.get(handle);

		if (!handler) {
			return Promise.resolve(undefined);
		}
		try {
			handler.handleUri(URI.revive(uri));
		} catch (err) {
			onUnexpectedError(err);
		}

		return Promise.resolve(undefined);
	}