Cannot unzip .zip even with Archive Utility

Hi,
I have problem unzipping a .zip file. When I use the Archive Utility to unzip it, it yields a file with the same name with .zip.cpgz on its end. When I subsequently make another trial - to unzip this new file, it yields the very same file only with .zip.cpgz 2 in the end of its name. A repeated process (now with any of these files, either original, first .cpgz or second .cpgz 2) yields a file with appropriate .cpgz #. Repeating the process further seemed to me futile. I hope writing here would in the long run yield an unzipped original .zip file.
Many thanks for your help,
pwyll.

You probably won't see this, but did you ever zip a file during this time and then unzip it with another program and find data missing? The same thing happened to me where I zipped an assignment with archive utility, then when I tried to unzip it it would just make copy after copy. Once it was unzipped by my professior there was missing data. THen when I downloaded another program to unzip the original zipped file, that data was missing, too! I tried it again and zipping the file kep deleting part of my file!

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=====================================================================
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Tried~
The problem is still here~ >___<
Anyway, thanks for information sharing~
The message is:
Cannot open file: it does not appear to be a valid archive.
If you downloaded this file, try downloading the file again.
The problem may be here:
if (fos != null)
fos.close() ;
if (bos != null)
bos.close();
if (zos != null)
zos.close();
if (file != null)
file = null ;
The fos is closed before bos so the last buffer is not
saved.
zos.close() is enough.

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