I have a windows slave. On that slave I have a build, which got "Execute system Groovy script" as a buildstep. I am running a simple script there:
def myFile = new File("C:/abc/abc.cmd")
def fileText = myFile.text
fileText = (fileText =~ /aa/).replaceFirst("bb")
myFile.write(fileText)
and I receive:
FATAL: C:/abc/abc.cmd (The system cannot find the path specified)

However, I am able to execute this script from node script console it runs just fine, so I suppose for some reason script is lucking permissions, when is executed as a build step.