Yahoo Messenger 9
From WPKG | Open Source Software Deployment and Distribution
You are going to need the ymsgr_inst_us.exe.
There are 2 ways to get this file:
1. Download it from filehippo.com (This is not the same file that Yahoo offers for download.)
2."Download it" using the installer from Yahoo. It will put the ymsgr_inst_us.exe file into a temporary directory. Here is a pic explainig how to find it using procexp: [1]
<package
id="ymsgr"
name="Yahoo Messenger"
revision="900"
reboot="false"
priority="1">
<check type="uninstall" condition="exists" path="Yahoo! Messenger" />
<install cmd='%SOFTWARE%\ymsgr\ymsgr_inst_us.exe /S /Q ' /> <!-- this does not launch the messenger after the installation... huh... :) -->
</package>