Description:
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The apacheconfig.php script bundled with the new MSI installer breaks; when selecting a directory from the installer, a semicolon is appended to the path. When it is passed to the script, the script builds configuration filenames as:

C:\Program Files\Apache Software Foundation\Apache2.2\conf\;httpd.conf

Fixing that error, it fails to backup the httpd.conf and mime.types files before editing.

Reproduce code:
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Select Apache 2.2 module from the list, pick a directory.

I fixed it by changing:

$foldername = str_replace(array('"', ';\\'), array('','\\'), $argv[2]);

Also even though I run as Administrator for the purposes of installing, the two backup checks fail for some reason. I didn't look into this so I just commented that entire elseif statement out for both files (I don't need a backup it was a fresh Apache 2.2 install with the default configuration file)