[XeTeX] \openout \append ?

[Philip Taylor (RHBNC)]

I am 99.999% certain that the answer is "no", but I still hope that the answer might be "yes" — is it possible to use \immediate \openout and \immediate \write in such a way as to append to an existing file rather than overwriting it ?  If not, is there a more efficient way of achieving this than opening the existing file for reading, copying it to a temporary file, closing both, re-opening the temporary file for reading, re-opening the existing file for writing, copying the former to the latter, and then and only then performing the desired \writes ?
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Philip Taylor

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