src/vs/workbench/api/browser/mainThreadFileSystem.ts/MainThreadFileSystem/$registerFileSystemProvider
class MainThreadFileSystem:	async $registerFileSystemProvider(handle: number, scheme: string, capabilities: FileSystemProviderCapabilities): Promise<void> {
		this._fileProvider.set(handle, new RemoteFileSystemProvider(this._fileService, scheme, capabilities, handle, this._proxy));
	}