diff --git a/milepost b/milepost
index 18c793d..28e0a6c 160000
--- a/milepost
+++ b/milepost
@@ -1 +1 @@
-Subproject commit 18c793dbb4fac59facc1877fbb04ea889ef2b895
+Subproject commit 28e0a6c88e3fb272d376d458a875300bb1531e23
diff --git a/samples/pong/build.sh b/samples/pong/build.sh
index f5fb063..028d57a 100755
--- a/samples/pong/build.sh
+++ b/samples/pong/build.sh
@@ -12,4 +12,4 @@ wasmFlags="--target=wasm32 \
 
 /usr/local/opt/llvm/bin/clang $wasmFlags -o ./module.wasm ../../sdk/orca.c src/main.c
 
-python3 ../../scripts/mkapp.py --orca-dir ../.. --name Pong --icon icon.png --data-dir dir1 module.wasm
+python3 ../../scripts/mkapp.py --orca-dir ../.. --name Pong --icon icon.png --data-file data/ball.png module.wasm
diff --git a/samples/pong/data/ball.png b/samples/pong/data/ball.png
new file mode 100644
index 0000000..c918ee5
Binary files /dev/null and b/samples/pong/data/ball.png differ
diff --git a/samples/pong/dir1/test_read.txt b/samples/pong/data/test_read.txt
similarity index 100%
rename from samples/pong/dir1/test_read.txt
rename to samples/pong/data/test_read.txt
diff --git a/samples/pong/src/main.c b/samples/pong/src/main.c
index ade684e..ac9f4c7 100644
--- a/samples/pong/src/main.c
+++ b/samples/pong/src/main.c
@@ -32,12 +32,7 @@ bool rightDown = false;
 
 mg_canvas canvas;
 mg_surface surface;
-
-#define TEST_IMAGE 1
-
-#ifdef TEST_IMAGE
 mg_image image;
-#endif
 
 mg_surface mg_surface_main(void);
 
@@ -47,57 +42,32 @@ void OnInit(void)
 	surface = mg_surface_main();
 	canvas = mg_canvas_create();
 
-#ifdef TEST_IMAGE
-	// create an image with a checkerboard pattern
-	u8 pixels[11*11*4];
-	for(int i=0; i<11*11/2; i++)
+
+	//NOTE: file test
+	file_handle file = file_open(STR8("/ball.png"), FILE_ACCESS_READ, 0);
+	if(file_last_error(file) != IO_OK)
 	{
-		pixels[8*i] = 0;
-		pixels[8*i+1] = 0;
-		pixels[8*i+2] = 0;
-		pixels[8*i+3] = 255;
-		pixels[8*i+4] = 255;
-		pixels[8*i+5] = 255;
-		pixels[8*i+6] = 255;
-		pixels[8*i+7] = 255;
+		log_error("Couldn't open file ball.png\n");
 	}
-	image = mg_image_create_from_rgba8(surface, 11, 11, pixels);
-
-	/*TODO Once we have file io and stb_image:
-
-		file_handle file = file_open(STR8("test.png"), FILE_OPEN_READ);
-		u64 size = file_size(file);
-		u8* data = mem_arena_alloc_array(mem_scratch(), u8, size);
-		file_read(file, size, data);
-		file_close(file);
-
-		image = mg_image_create_from_data(surface, size, data); // --> that will call stbi_load_from_memory(), see milepost/src/graphics_common.c
-
-		mem_arena_clear(mem_scratch());
-	*/
-#endif // TEST_IMAGE
-
-	//NOTE: testing file io
-	file_handle file = file_open(STR8("/test_write.txt"), FILE_ACCESS_WRITE, FILE_OPEN_CREATE);
-	if(file_last_error(file) == IO_OK)
-	{
-		str8 string = STR8("Hello, file!\n");
-		file_write(file, string.len, string.ptr);
-		file_close(file);
-	}
-	else
-	{
-		log_error("Couldn't open file test_write.txt\n");
-	}
-
-	file = file_open(STR8("/dir1/test_read.txt"), FILE_ACCESS_READ, 0);
 	u64 size = file_size(file);
 	char* buffer = mem_arena_alloc(mem_scratch(), size);
 	file_read(file, size, buffer);
 	file_close(file);
 
-	log_info("read file: %.*s", (int)size, buffer);
+	file = file_open(STR8("/test.txt"), FILE_ACCESS_WRITE, FILE_OPEN_CREATE);
+	if(file_last_error(file) != IO_OK)
+	{
+		log_error("Couldn't open/create file test.txt\n");
+	}
+	str8 test_string = STR8("Hello, world\n");
+	file_write(file, test_string.len, test_string.ptr);
+	file_close(file);
 
+	/*NOTE: Do this when we can compile stb to wasm
+		image = mg_image_create_from_data(surface, str8_from_buffer(size, buffer), false);
+	*/
+
+	mem_arena_clear(mem_scratch());
 }
 
 void OnFrameResize(u32 width, u32 height)
@@ -216,12 +186,8 @@ void OnFrameRefresh(void)
 	mg_set_color(paddleColor);
 	mg_rectangle_fill(paddle.x, paddle.y, paddle.w, paddle.h);
 
-#ifdef TEST_IMAGE
-	mg_image_draw(image, ball);
-#else
 	mg_set_color(ballColor);
 	mg_circle_fill(ball.x+ball.w/2, ball.y + ball.w/2, ball.w/2.);
-#endif
 
     mg_matrix_pop();
 
diff --git a/src/main.c b/src/main.c
index 133ba21..c4c98b2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -441,7 +441,7 @@ void* orca_runloop(void* user)
 		str8 localRootPath = path_executable_relative(mem_scratch(), STR8("../app/data"));
 
 		io_req req = {.op = IO_OP_OPEN_AT,
-		              .open.rights = FILE_ACCESS_READ,
+		              .open.rights = FILE_ACCESS_READ|FILE_ACCESS_WRITE,
 		              .size = localRootPath.len,
 		              .buffer = localRootPath.ptr};
 		io_cmp cmp = io_wait_single_req_with_table(&req, &app->fileTable);