non-wordpress files in wordpress installation directory

Open your .htaccess in the root folder which once opened should look something like this

# BEGIN WordPress<IfModule mod_rewrite.c>RewriteEngine OnRewriteBase /RewriteRule ^index\.php$ - [L]RewriteCond %{REQUEST_FILENAME} !-fRewriteCond %{REQUEST_FILENAME} !-dRewriteRule . /index.php [L]</IfModule># END WordPress`

Then add this above all of that and place your directory in designated spot "replacewith subdirectory name" you can add as many subs as you like

<IfModule mod_rewrite.c>RewriteEngine OnRewriteBase /RewriteCond %{REQUEST_URI} ^/REPLACE WITH SUB DIRECTORY NAME/(.*)$ [OR]RewriteCond %{REQUEST_URI} ^/REPLACE WITH SECOND SUBDIRECTORY NAME/(.*)$ [OR]RewriteRule ^.*$ - [L]</IfModule>`

Final Result should look like this if my subdirectory was named other

<IfModule mod_rewrite.c>RewriteEngine OnRewriteBase /RewriteCond %{REQUEST_URI} ^/other/(.*)$ [OR]RewriteRule ^.*$ - [L]</IfModule># BEGIN WordPress<IfModule mod_rewrite.c>RewriteEngine OnRewriteBase /RewriteRule ^index\.php$ - [L]RewriteCond %{REQUEST_FILENAME} !-fRewriteCond %{REQUEST_FILENAME} !-dRewriteRule . /index.php [L]</IfModule># END WordPress`

If I understand this you have wordpress installed on your server in its own folder, something like www/wordpress/. You also have a *.html file stored in www/test.html correct?

If I'm on track, then the issue is when you configured this you would have told it to use the wordpress directory. The best solution is to either move that file into the www/wordpress directory or into its own directory off that one, so you could have www/wordpress/test.html or www/wordpress/tests/test.html.

For question 2 I think what you are asking is can you do something like www/wordpress/ having a wordpress site, but then www/wordpress/wordpress2/ having another site. Though this is possible it isn't the best idea, why would you want to do this? You should have www/wordpress/ and www/wordpress2/. If the sites are connected in some way, you should look into wordpress mu, which is a multi site, which will allow you to run many sites all from the same installation.

Question 3 was answered above but yes you can do something like www/wordpress/tests/test.html.

You may need to change your .htaccess rules if you want to be able to access html files under your wordpress install.