Downloads Permissions

[ZiNgA BuRgA]

For Apache, yes.
Quick web search: http://altlab.com/htaccess_tutorial.html

For the above example, you'll need to change the RewriteRule (last line) to cover the XThreads attachment script, which depends on how the URL is structured, eg

Code:

RewriteRule ^/path_to_forum/xthreads_attach\.php http://i.imgur.com/qX4w7.gif [L]

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