Fixed crash on Windows due to not ensuring file mode is binary for saving app icons

Gemfile.lock

@@ -35,6 +35,7 @@ GEM
       rake (>= 12.0.0, < 14.0.0)
     excon (0.78.1)
     ffi (1.15.5)
+    ffi (1.15.5-x64-mingw-ucrt)
     ffi (1.15.5-x64-mingw32)
     fiber-local (1.0.0)
     gosu (1.4.1)
@@ -61,6 +62,7 @@ GEM
     timers (4.3.3)
 
 PLATFORMS
+  x64-mingw-ucrt
   x64-mingw32
   x86_64-linux
 

lib/ico.rb

@@ -134,7 +134,7 @@ class W3DHub
       if image_bmp?(image)
         to_rgba32_blob(image).save(filename)
       else
-        File.write(filename, image_data(image))
+        File.open(filename, "wb") { |f| f.write(image_data(image)) }
       end
     end
   end