I'm afraid you have no other choice than use the app that created this unusual wallet file.
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.
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.