The Unarchiver (1000)

945 Name: Anthony : 2011-06-07 00:12 ID:G3ILbYwu [Del]

I'm a beginner here so I may be asking a dumb question, please bear with me as I've not been able to find an answer anywhere else.
I zipped a large folder of files to save space on a laptop (zipped, about 5GB) using the built-in function in Windows XP. I changed the name of the zip file - from something like xyz_123.zip to 1.zip. Now XP's inbuilt extract says that the archive is 'incomplete' or 'corrupted'. I've tried various other programs (7-zip, Winzip, etc) without success. I moved the archive over to my iMac (10.6.) and tried Stuffit Expander also without success. I then discovered The Unarchiver and tried it: It started to work and extracted about 10% of the files before failing with "Error during decrunching".
Any ideas?
The only thing I can think of: is it a bad move to change the name of a .zip archive? Is the name also internally-coded so that both must be the same?
cheers, and thanks in advance if you answer my questions.

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