The following bug has been logged online:

Bug reference: 2630
Logged by: Alan Escreet
Email address: leet3lite (AT) gmail (DOT) com
PostgreSQL version: 8.1.4
Operating system: Windows
Description: Can't unpack
Details:

I am unable to unpack the database from the tar.gz file. I have tried all
the suggested packages to do so from the gzip website, but they were all
unsuccessful. I have checked the downloaded file's md5 checksum and it is
ok. Is there an error in the tar.gz file?
Is there a differently packaged PostgreSQL that I can try (i.e. a zip file)?
It has taken me 3 hours so far trying to get the database out of the box
with no success...

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If you're building from source, the tar package of msys should work just
fine, and you need msys anyway.

If you just want the binary installer, you are downloading the wrong
file - you'll want the ZIP archive at
http://www.postgresql.org/ftp/binary/v8.1.4/win32/.

//Magnus

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