Borrow Android device from one of your friends/collogues, somebody around you have to have one.
Other option is to use good, trusted escrow to import this wallet in to his device and just send you the coins, dogechain fees are small so not to much loss in the process, of course some escrow fee must be considered.
Or you can just wait doge will spike again ( in like 5years ) In this case download this app and store with your wallet file, who knows, maybe it will be removed from store in the future.
Thanks for letting me know about my options. This wallet app has generated a rather unusual wallet file.Looks like I need to find a reputable escrow who can get the Dogecoins off of this and send it back to me after the escrow fee is taken off.
Know anyone who has an android device that can install the app,then import this file into the app and use my password to open it and then send the coins back to my new address?
In the meantime I'll be looking around for a second hand cheap android smartphone that can run this wallet.
I've used android emulators on my mac but they all keep crashing and don't let me access the Play store and again I don't have a PC to hand (not sure if bootcamp can help here?)
Thanks for your help everyone,it seems there's no other way than either getting an android smartphone to open this wallet or ask an escrow to do so for a fee.