> Typically what happens to cause this is a filestream gets left open and 
> is awaiting execution by the registry. A garbage collect will detect the 
>    weak oop and cause the executor to run, closing the file and 
> releasing the FILE pointer in the VM. Then you can delete the file.
>
> Most likely the answer is a simple code change to make sure the file is 
>  closed explicitly.

Thanks Tim.  Yep, that looks like the culprit all right.  I've trawled through the file-handling code putting an ensure: block around every file-opening, that closes the file explicitly.





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