diff --git a/instead.rss b/instead.rss
index b66107e..f7f351b 100644
--- a/instead.rss
+++ b/instead.rss
@@ -45,7 +45,7 @@ RESOURCE FILESELECTIONDIALOG r_file_selection_dialog {
 		FILTER {
 			filter_type = EFilenameFilter;
 			filter_style = EInclusiveFilter;
-			filter_data = { "*.lua", "*.zip" };
+			filter_data = { "*.lua", "*.zip", "*.idf" };
 		}
 	};
 }
diff --git a/src/sdl-instead/main.c b/src/sdl-instead/main.c
index de63d21..912b7d6 100644
--- a/src/sdl-instead/main.c
+++ b/src/sdl-instead/main.c
@@ -262,7 +262,16 @@ int main(int argc, char *argv[])
 	}
 
 	if (idf_sw) {
-		idf_create("data.idf", idf_sw);
+		char *p = malloc(strlen(idf_sw) + 5);
+		if (p) {
+			char *b;
+			strcpy(p, idf_sw);
+			b = basename(p);
+			strcat(b, ".idf");
+			idf_create(b, idf_sw);
+			free(p);
+		} else
+			idf_create("data.idf", idf_sw);
 		goto out;
 	}
 	menu_langs_lookup(dirpath(LANG_PATH));