in reply to What does this print for you?

Works under Vista with both 32-bit 5.8.9 & 64-bit 5.10.1 

[23:06:10.70] c:\test>\perl32\bin\perl.exe -e"print pack q/d*/,(1.7453
+026326120991e+194,1.5156845462257262e-147)"
Merry Christmas!


[23:06:43.10] c:\test>\perl64\bin\perl.exe -e"print pack q/d*/,(1.7453
+026326120991e+194,1.5156845462257262e-147)"
Merry Christmas!

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A possible difference is their hardware uses a different double-precision float native format.

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