The standard Maven binary distribution has renamed its bin\mvn.bat file to bin\mvn.cmd starting with Maven 3.3. When trying to run a Maven 3.3 task with this distribution, the following error will be given:

Unable to find executable at c:\opt\java\tools\maven\apache-maven-3.3.3\bin\mvn.bat. Will try to run it anyway.
'c:\opt\java\tools\maven\apache-maven-3.3.3\bin\mvn.bat' is not recognized as an internal or external command, operable program or batch file.

The task should be updated to be able to handle either file extension.