When Jenkins running on Linux issues a job to a vm slave running windows 7, the WORKSPACE environment variable received by the slave running a batch file has Unix style path separators instead of windows style path separators (). As a result, batch file commands such as 'DEL %WORKSPACE%*' results in a failure such as 'users is not a valid option' (because WORKSPACE is set to C:/users/build/workspace).

Other combinations of Jenkins/slave OSs not attempted.

Workaround is to simply replace '/' with '\' in WORKSPACE and job runs smoothly.