set file extension for download_list

src/main.rs

@@ -205,6 +205,7 @@ async fn main()->AResult<()>{
 				subcommand.asset_ids.into_iter().map(|asset_id|{
 					let mut path=output_folder.clone();
 					path.push(asset_id.to_string());
+					path.set_extension("rbxm");
 					(asset_id,path)
 				}).collect()
 			).await