i have done the URL rewrite using .htaccess in a php project using the appserve5.0 it is spporting the extension .html or any other bt not the extension .htm plz help me about this

you need to code the rewrite to handle .htm in that case.

In plugin from URL Rewrite is "URL Rewrite 1.1.18 - 1.1.18 - Enables short URLs using Apache mod_rewrite, ISAPI Rewrite, or PathInfo"
Where is Apache mod_rewrite. in my system gallery 2.3
If my system where I have installed my gallery it is system linux, it should be enabled the mod_rewrite, but alone this activated the two options of Windows
That it is what I have to make to enable the Apache mod_rewrite
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That last post didn't really make any sense.

Sounds like you are trying to install Gallery on your Linux server, and it's asking for mod_rewrite? If so, it should be in there- most Apache distributions nowadays come with mod_rewrite as standard. If not, you will be able to install it.

What version of Linux are you running?