diff --git a/build_file.c b/build_file.c
index 3776326..544b433 100644
--- a/build_file.c
+++ b/build_file.c
@@ -41,7 +41,7 @@ int main(int argc, char **argv) {
     b32 core_test_target = false;
     b32 win32_target = true;
     b32 standalone_w32_target = false;
-    b32 wasm_target = true;
+    b32 wasm_target = false;
 
     if (run_server) {
         os_systemf("start /D ..\\package ..\\package\\run_server.bat");
diff --git a/package/index.html b/package/index.html
index e90ed68..7bd78a6 100644
--- a/package/index.html
+++ b/package/index.html
@@ -173,6 +173,31 @@ const wasm_app_imports = {
         window.requestAnimationFrame(wasm_update);
     }
 
+    canvas.addEventListener('dragover', e => { e.preventDefault(); });
+    canvas.addEventListener("drop", (e) => {
+        e.preventDefault();
+        if (e.dataTransfer.items) {
+            [...e.dataTransfer.items].forEach((item, i) => {
+                if (item.kind === "file") {
+                    let file = item.getAsFile();
+                    let reader = new FileReader();
+
+                    let blob = file.slice(0, file.size);
+                    reader.onload = (e) => {
+                        if (e.target.error != null) {
+                            console.log("failed to read file: ", e.target.error);
+                            return;
+                        }
+                        let result = e.target.result;
+
+                        // console.log(new TextDecoder().decode(result));
+                    }
+                    reader.readAsArrayBuffer(blob);
+                }
+            });
+        }
+    });
+
     addEventListener("resize", (event) => { wake_up(); });
     addEventListener("keydown", (event) => {
         if (["F1", "F2", "F3", "p"].includes(event.key)) event.preventDefault();
diff --git a/src/app/app_wasm.html b/src/app/app_wasm.html
index e90ed68..7bd78a6 100644
--- a/src/app/app_wasm.html
+++ b/src/app/app_wasm.html
@@ -173,6 +173,31 @@ const wasm_app_imports = {
         window.requestAnimationFrame(wasm_update);
     }
 
+    canvas.addEventListener('dragover', e => { e.preventDefault(); });
+    canvas.addEventListener("drop", (e) => {
+        e.preventDefault();
+        if (e.dataTransfer.items) {
+            [...e.dataTransfer.items].forEach((item, i) => {
+                if (item.kind === "file") {
+                    let file = item.getAsFile();
+                    let reader = new FileReader();
+
+                    let blob = file.slice(0, file.size);
+                    reader.onload = (e) => {
+                        if (e.target.error != null) {
+                            console.log("failed to read file: ", e.target.error);
+                            return;
+                        }
+                        let result = e.target.result;
+
+                        // console.log(new TextDecoder().decode(result));
+                    }
+                    reader.readAsArrayBuffer(blob);
+                }
+            });
+        }
+    });
+
     addEventListener("resize", (event) => { wake_up(); });
     addEventListener("keydown", (event) => {
         if (["F1", "F2", "F3", "p"].includes(event.key)) event.preventDefault();
diff --git a/src/os/os_win32.c b/src/os/os_win32.c
index 974ff1d..77b949c 100644
--- a/src/os/os_win32.c
+++ b/src/os/os_win32.c
@@ -108,6 +108,34 @@ fn os_write_t os_write(s8_t path, s8_t content) {
     return result;
 }
 
+// @todo: improve to return error codes
+fn s8_t os_read(ma_arena_t *arena, s8_t path) {
+    s8_t result = {0};
+    ma_temp_t scratch = ma_begin_scratch1(arena);
+    s16_t path16 = s16_from_s8(scratch.arena, path);
+    HANDLE handle = CreateFileW(path16.str, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+    if (handle != INVALID_HANDLE_VALUE) {
+        LARGE_INTEGER file_size;
+        if (GetFileSizeEx(handle, &file_size)) {
+            if (file_size.QuadPart != 0) {
+                result.len = file_size.QuadPart;
+                result.str = ma_push_array(arena, char, result.len + 1);
+                assert(result.len == (i64)(DWORD)result.len);
+                DWORD read;
+                if (ReadFile(handle, result.str, (DWORD)result.len, &read, NULL)) { // @todo: can only read 32 byte size files?
+                    if (read == result.len) {
+                        result.str[result.len] = 0;
+                    }
+                }
+
+            }
+        }
+        CloseHandle(handle);
+    }
+    ma_end_scratch(scratch);
+    return result;
+}
+
 typedef struct w32_file_iter_t w32_file_iter_t;
 struct w32_file_iter_t {
     HANDLE           handle;
diff --git a/src/ui/ui.c b/src/ui/ui.c
index 2e4aedd..45a0048 100644
--- a/src/ui/ui.c
+++ b/src/ui/ui.c
@@ -389,10 +389,10 @@ struct ui_draw_compute_t {
 
 fn r2f32_t ui_get_appear_rect(ui_box_t *box) {
     r2f32_t result = box->rect;
-    f32 appear_t = f32_ease_out_n(f32_clamp01(box->appear_t * 2), 10);
-    if (!ui_id_is_null(box->id)) {
+    if (box->flags.animate_appear && !ui_id_is_null(box->id)) {
         v2f32_t size = v2f32_muls(r2f32_get_size(result), 0.15f);
         r2f32_t smaller_rect = r2f32_shrink(result, size);
+        f32 appear_t = f32_ease_out_n(f32_clamp01(box->appear_t * 2), 10);
         result = r2f32_lerp(smaller_rect, result, appear_t);
     }
     return result;
@@ -622,7 +622,7 @@ fn ui_signal_t ui__label_button(ui_code_loc_t loc, char *str, ...) {
 #define ui_label(...) ui__label(UILOC, __VA_ARGS__)
 fn ui_box_t *ui__label(ui_code_loc_t loc, char *str, ...) {
     S8_FMT(tcx->temp, str, string);
-    ui_box_t *box = ui_box(.loc = loc, .string = string, .flags = {.draw_text = true});
+    ui_box_t *box = ui_box(.loc = loc, .string = string, .flags = {.draw_text = true, .animate_appear = true});
     return box;
 }
 
@@ -751,13 +751,13 @@ fn void ui_end_reversal(void) {
 
     ui_box_t *first2 = NULL;
     ui_box_t *last2 = NULL;
-    for (ui_box_t *it = first, *next = it->next; next; it = next) {
+    for (ui_box_t *it = first, *next = NULL; it; it = next) {
         next = it->next;
         DLLQ_REMOVE(it->parent->first, it->parent->last, it);
         DLLQ_APPEND(first2, last2, it);
     }
 
-    for (ui_box_t *it = last2, *prev = it->prev; prev; it = prev) {
+    for (ui_box_t *it = last2, *prev = NULL; it; it = prev) {
         prev = it->prev;
         DLLQ_REMOVE(first2, last2, it);
         DLLQ_APPEND(it->parent->first, it->parent->last, it);
@@ -1192,11 +1192,11 @@ fn void ui_begin_frame(app_frame_t *frame) {
 fn void ui_end_frame(void) {
     for (ui_box_t *box = ui->hash_first, *next = NULL; box; box = next) {
         next = box->hash_next;
-        // if (box->flags.animate_appear) {
+        if (box->flags.animate_appear) {
             box->appear_t += (f32)ui->frame->delta;
-        // } else {
-        //     box->appear_t = 1;
-        // }
+        } else {
+            box->appear_t = 1;
+        }
         if (ui_is_hot_box(box)) {
             box->hot_t += (f32)ui->frame->delta;
         } else {
diff --git a/src/ui/ui.h b/src/ui/ui.h
index 2550818..af29593 100644
--- a/src/ui/ui.h
+++ b/src/ui/ui.h
@@ -169,7 +169,6 @@ fn b32 ui_is_focused_box(ui_box_t *box) { return !ui_is_null_box(box) && box->id
 #define ui_dm(V) ((V) * rn->main_font->computed_xchar_size)
 #define ui_max 200000000.f
 #define ui_children_sum 0
-#define ui_box_flags(...) (ui_box_flag_t){__VA_ARGS__}
 
 fn ui_id_t ui_id(s8_t string);
 fn ui_id_t ui_idf(char *str, ...);