Vielleicht ist ja da was dabei
Provides support for 3rd party plug-ins for Internet Connection Sharing/Internet Connection Firewall. Required if using Internet Connection Sharing/Internet Connection Firewall to connect to the internet.
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http://hr.uoregon.edu/davidrl/windowsxp.html:
Allows the addition of 3rd party software plug-ins to work with either Internet Connection Sharing or Internet Connection Firewall (ICF). For example, enhanced firewall monitoring and logging software could be installed as a plug-in with ICF only with this setting enabled. If unsure, choose Manual.
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An anonymous visitor added the following warning at 21.08.2004:
http://www.2-spyware.com/file-alg-exe.html
Its a system process which is used to provide network access to any program, including the operating system. The same or similar file name can be used by spyware or adware programs to decept user.