WSE is not support on Win98. See here for supported platforms

http://msdn.microsoft.com/webservices/building/wse/wse20sp1readme.aspx

Thanks, Mark
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Thread-Topic: WSE2 on Win98??????
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From: "=?Utf-8?B?S2VubnkgTS4=?=" <KennyM@discussions.microsoft.com>
Subject: WSE2 on Win98??????
Date: Mon, 22 Nov 2004 17:47:01 -0800
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Hi

My development machine has Win XP but my clients Pcs have Win 98 SE

Is it possible for my app to use WSE2 in order to comunicate with my
Wservices knowing that clients will be deployed on Win98?

Ken