Update windows.md

docs/en/manuals/windows.md

@@ -13,9 +13,9 @@ Windows specific application configuration is done from the [Windows section](/m
 
 ## Application icon
 
-The application icon used for a Windows game must be in the .ico format. You can easily create a .ico file from a .png file using an online tool such as [ICOConvert](https://www.icoconverter.com/). Upload an image and use the following icon sizes:
+The application icon used for a Windows game must be in the .ico format. You can easily create a .ico file from a .png file using an online tool such as [ICOConvert](https://www.icoconverter.com/) or [AConvert](https://www.aconvert.com/icon/png-to-ico/). Upload an image and use at least the following icon sizes: 16x16, 24x24, 32x32, 48x48, 256x256.
 
-![Windows icon sizes](images/windows/windows-icon.png)
+Source: [Microsoft - Windows app icon construction](https://learn.microsoft.com/en-us/windows/apps/design/style/iconography/app-icon-construction#icon-sizes-win32)
 
 ## FAQ
 :[Windows FAQ](../shared/windows-faq.md)