User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4a) Gecko/20030305 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4a) Gecko/20030305 When I sent WWW_OpenURL topic of Windows DDE to Mozilla, 20030306xx and later builds are always creating new navigator window and loading the page in the new window. I set the HTML file's config on explorer. DDE Message: "%1",,-1 Application: Mozilla Topic: WWW_OpenURL Reproducible: Always Steps to Reproduce: 1. Set the HTML file's config on explorer and 3rd parameter of DDE Message is -1 or 4294967295. 2. Double click any HTML file on explorer. 3. Actual Results: the HTML file is opened by New Window. Expected Results: the HTML file should be opened by last active window(tab). this problem is not exists in 2003030508-trunk/WinXP. But exists in 20030306xx-trunk/WinXP.

Oh, this related problem is forgot by people. see Bug 84548.

sorry, -> 2. Double click any HTML file on explorer. it was no function....

I mistook, this problem is able to be easily tested with HTTP Protocol, not HTML files. You make Mozilla a default application of HTTP protocol (that setting parameter equal to comment 0). And you can reproduce this problem to click on link of another application(with DDE supported).

I can't reproduce with 2003031204-trunk/WinXP. -> WFM

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*** This bug has been marked as a duplicate of 92156 ***