I am searching Google since a minimum of twenty minutes and It's surprising it's that difficult to find...

It ought to be pretty easy however i can't decipher it...

The Issue:

I wish to put a HTML file in the same degree of my Wordpress, try not to want the RewriteRules to "trap" this site and think it is a redirect...

THE HTACCESS:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /

# >> here << this next line is my TEST....
RewriteRule ^test\.htm$ test.htm [L]

RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

Obviously, a webpage known as "test.htm" is submitted around the server.

As mentioned, the road where I put my test does not work. It shows the WordPress home page, rather than my "test.htm" page I submitted.

You could try that one:

RewriteRule ^test\.htm$ - [PT,L]

It passes through (PT) the request and doesn't apply any more rules (L).