You have 3 options:
1) Place the "jboss-ejb-client.properties" file in the classpath of the application
2) Set the path to file via System Property as JRE command line parameter
-Djboss.ejb.client.properties.file.path=C:\jboss-ejb-client.properties
3) Set the path to file via System Property during runtime
System.setProperty("jboss.ejb.client.properties.file.path", "C:\\jboss-ejb-client.properties");