How-to-Extract the Mameinfo.dat file under Unix/Linux and Mac OS systems
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The Mameinfo.dat is now compressed with the newest version of 7-Zip (4.42) and
the compression method PPMd:

Archive format: 7z
Compression level: Ultra
Compression method: PPMd
Dictionary size: 256 MB
Word size: 24
Create solid archive
Create SFX archive

 
The SFX module is since version 4.30 beta uncompressed, so if you compress
it again with the format Zip, you get a more smaller file :)

Archive format: Zip
Compression level: Ultra
Compression method: Deflate
Dictionary size: 32 KB
Word size: 128



Extract the Mameinfo.zip
------------------------

The simple way to extract the Mameinfo.zip that should work on all Linux systems and on
any Mac OSX system is as follows, step by step.


Go here

http://sourceforge.net/project/showfiles.php?group_id=111810


Download the "src_all.tar" file. The current version is named p7zip_4.32_src_all.tar.bz2

Go to the directory you downloaded that file to and type these commands:

tar -xvjf p7zip*
cd p7zip*


If you are on a Linux system type this:

cp makefile.linux_x86_ppc_alpha makefile.machine



If you are on a Mac OSX system type this:

cp makefile.macosx makefile.machine
make
cp bin/7za /usr/local/bin/7za

Done.



To extract the Mameinfo.zip file do this:

unzip Mameinfo*
7za x Mameinfo*.exe

Done.