Obtain password from external source (CMD, EXT) doesn't work on Windows.

Try to create new CS which obtains password from external source:

/subsystem=elytron/credential-store=myCredStore:add(location="myCredStore.jceks", create=true, credential-reference={clear-text="{CMD}C:\path\to\scrit\pass.bat,VerySecretPassword", type=COMMAND}, relative-to=jboss.server.config.dir)

pass.bat file contains only this

echo %1

Because of https://issues.jboss.org/browse/JBEAP-9211 you must do this extra step:
Add new alias to CS -> JCEKS file is created

Please try it open directly with pass "VerySecretPassword" -> it doesn't work on Windows.

In my opinion there is problem with back slashes in script path.
https://github.com/wildfly/wildfly-core/blob/3.0.0.Alpha22/controller/src/main/java/org/jboss/as/controller/security/CredentialReference.java#L198

Because when I add there back slashed to path then it works.