diff --git a/src/BigFiles.rc b/src/BigFiles.rc
index 66e452c..3f8a1cd 100644
--- a/src/BigFiles.rc
+++ b/src/BigFiles.rc
@@ -79,15 +79,15 @@ END
 // Bitmap
 //
 
-IDB_BITMAP1             BITMAP                  "back.bmp"
+IDB_BITMAP1             BITMAP                  "back.png"
 
-IDB_BITMAP2             BITMAP                  "forward.bmp"
+IDB_BITMAP2             BITMAP                  "forward.png"
 
-IDB_BITMAP3             BITMAP                  "open.bmp"
+IDB_BITMAP3             BITMAP                  "open.png"
 
-IDB_BITMAP4             BITMAP                  "down.bmp"
+IDB_BITMAP4             BITMAP                  "down.png"
 
-IDB_BITMAP5             BITMAP                  "up.bmp"
+IDB_BITMAP5             BITMAP                  "up.png"
 
 
 /////////////////////////////////////////////////////////////////////////////
diff --git a/src/back.png b/src/back.png
new file mode 100644
index 0000000..b451345
Binary files /dev/null and b/src/back.png differ
diff --git a/src/down.png b/src/down.png
new file mode 100644
index 0000000..9017b0d
Binary files /dev/null and b/src/down.png differ
diff --git a/src/forward.png b/src/forward.png
new file mode 100644
index 0000000..eab9951
Binary files /dev/null and b/src/forward.png differ
diff --git a/src/open.png b/src/open.png
new file mode 100644
index 0000000..71ff252
Binary files /dev/null and b/src/open.png differ
diff --git a/src/up.png b/src/up.png
new file mode 100644
index 0000000..bf5fe6a
Binary files /dev/null and b/src/up.png differ