Perl stored the number as an unsigned 2's complement, but something along the way treated it as an signed 2's complement 
-30107963 + 2**32 = 4264859333

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I don't know who exactly is at fault, and what can be done to fix it.

Update: Forcing the number to be stored as a float internally might do the trick. The following does that: 

$x = $x + 0.5 - 0.5;

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In reply to Re: Problem with OLE Excel by ikegami
in thread Problem with OLE Excel by Anonymous Monk

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