ETL.xml not found error

This error is displayed when running the ETL tool outside of the ETL_Tool/bin directory (which is usually the case when used in conjunction with a scheduler):

Exception in thread 'main' java.lang.RuntimeException: Failed to parse ETL.xml file... File "ETL.xml" not found.

at largesoft.tools.etl.ETLConfigInfoHandler.parse(ETLConfigInfoHandler)
at largesoft.tools.etl.ETLTool.initTransform(ETLTool.java) 
at largesoft.tools.etl.ETLTool.performTransformation(ETLTool.java) 
at largesoft.tools.etl.ETLTool.performTransformation(ETLTool.java) 
at largesoft.tools.etl.ETLTool.main(ETLTool.java)

As described in the ETL help menu (available when invoking etl.sh -help), the conf_dir command line parameter must be specified, for example: C:\dev\Reports\ETL_Tool\bin\etl -conf_dir "C:\dev\Reports\ETL_Tool\conf"