Would it be possible for you to upload the icon to a 3rd party host site for me to download and check the file?
Examples include Google Drive, OneDrive or DropBox. Then simply send me the shared URL in a private message.

Windows icon concept is notably different to the MacOS version in respect of how it works. Micro$oft were taken to court by Apple over copying the icon concept (a person who worked upon introducing icons to Windows was an ex Apple employee.) But M$'s icon version works in a somewhat clumsy and unnecessarily complicated manner.