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In version 3.2 Hotfix 1616 there was a problem with page redirection and custom page extensions.
Which is your exact version? You may check it by following the steps in that KB Article - http://www.sitefinity.com/support/knowledge-base/kb-article/b1154K-bbac-b1154T-cgb.aspx
This information will help us to test your problem in the exact environment.
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