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try this:

cd [path to limewire]

[path to jdk or jre]\javaw.exe -cp . RunLime

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or this:

make a link with these properties

target: "c:\windows\javaw.exe -cp . RunLime"

working directory: ""C:\programs\LimeWire 1.6d"
(or wherever your limewire is installed)
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this all assumes that the client you are talking about is LimeWire, but im'm pretty sure it is.

squee