src/vs/platform/protocol/electron-main/protocolMainService.ts/ProtocolMainService/requestToNormalizedFilePath
class ProtocolMainService:	private requestToNormalizedFilePath(request: Electron.ProtocolRequest): string {

		// 1.) Use `URI.parse()` util from us to convert the raw
		//     URL into our URI.
		const requestUri = URI.parse(request.url);

		// 2.) Use `FileAccess.asFileUri` to convert back from a
		//     `vscode-file:` URI to a `file:` URI.
		const unnormalizedFileUri = FileAccess.asFileUri(requestUri);

		// 3.) Strip anything from the URI that could result in
		//     relative paths (such as "..") by using `normalize`
		return normalize(unnormalizedFileUri.fsPath);
	}