.htaccess is either in your website root directory or your /forum/ directory. If it is in the forum root is affects all folders below it, if it is in /forum/ it affects /forum/ and any folders below that.
If it doesn't exist (it does not by default in vBulletin 4.x) you can create your own, it is a plain text file called .htaccess
If it doesn't exist (it does not by default in vBulletin 4.x) you can create your own, it is a plain text file called .htaccess
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