Phonegap / cordova Android signing keystore no extension

i'm switching phonegap / cordova cli phonegap build compile apps. used use commands

1. phonegap build android
2. cd platforms/android
3. ant release

i had ant.properties file containing code:

key.store = /users/xx/myappkey 
key.alias = myapp 

as can see, myappkey should .keystore file doesn't have extension , therefore phonegap build refusing file signing key file. how can solve issue because i'd using phonegap build on, including key signing

you can't rename keystore file , add extension?

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