We try try to initialize a KieBase like this: but no rule files where found. Spending some time for debugging, we realized that in KieBuilderImpl (and other places) file names are compared with linux path delimiter but - as usally known - Windows file system uses '\' . We made the followin hack in org.drools.compiler.commons.jci.readers.DiskResourceReader : and everything runs. Please respect that some people have to use windows (unfortunatly ...) -- View this message in context: http://drools.46999.n3.nabble.com/Unable-to-initialize-KieBase-from-Windo... Sent from the Drools: User forum mailing list archive at Nabble.com.