Following a failed sync in a previous job (example:  using wrong charset when syncing a unicode file), the next job's sync fails with "The process cannot access the file because it is being used by another process."

Log:
Unable to delete, trying alternative method... Unable to delete file: d:\jenkins\jbrown-win10\workspace\bugs\sync-unicode-windows
{{Unable to delete path: d:\jenkins\jbrown-win10\workspace\bugs\sync-unicode-windows\cases\syncunicode\big4.uni }}

error: d:\jenkins\jbrown-win10\workspace\bugs\sync-unicode-windows\cases\syncunicode\big4.uni: The process cannot access the file because it is being used by another process.

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Workaround: restart the node that is giving the error. The cause of the previous failure needs first be determined and fixed.