Windows 8 - Can't tags PNG pictures

Hello,
I work as a graphic designer, and recently I received +1000 product pictures, and I want to tag each picture so I could find them more easily when needed.
When I try to right click -> properties -> details , the only option I can see is " Date taken ", and I can't add any other property.

When I try doing this with JPEG it works with no problem.

I found I can use Photo Gallery and tag the pictures, but it only save the tag information on my computer and requires me to use Photo Gallery if I want to check the tags
And I can't do that, because we're using the pictures on on a server with more computers accessing the files, and I want all of them to be able to search the tags .

I just can't accept that this is something that can't be done.
I would really appreciate any help.

Thank you very much in advance.
 
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