.htaccess not work

Hosting Support
1

Website URL: http://ender-craft.ga

I created an .htaccess file in the htdocs folder with these rules:

RewriteCond% {REQUEST_FILENAME} .html -f RewriteRule!. * \. Html $% {REQUEST_FILENAME} .html [QSA, L]

The .htaccess file does not work.

2

Maybe the htaccess file content should (or may) be this:

RewriteEngine On
RewriteCond %{REQUEST_FILENAME}\.html -f
RewriteRule !.*\.html$ %{REQUEST_FILENAME}.html [QSA,L]

Please note that Apache is sensitive to space positioning, and so the rule you posted before was not valid on that case.