Robert Rohde added the comment:
It's Windows 7 Ultimate (64-bit) on a very high end system.
I don't think it would be very practical to distribute a 2 GB test file.
Though I might be able to get it to a couple people if someone wanted to really
study the issue.
Though if it is
New submission from Robert Rohde :
I attempted to use GZipFile to process a 1.93 GB file that expands to 18.8 GB.
This consistently produces the same corrupted output file that has
approximately, but not exactly, the right output file size.
I bypassed GZipFile by calling the 7-Zip executable
