Well then, at some point you or someone sitting at your machine ran the XAMPP Security script (and created a User called 'mini)'.
If you are lucky whomever did that checked the box 'create text files' - called xamppdirpasswd.txt and mysqlrootpasswd.txt - they would be in the same folder. The passwords for 'root' (MySQL) and 'mini' should be in them. Or your memory may be jogged and you know what 'goes' with 'mini'...
If not, delete the .htaccess file in \xampp\htdocs\xampp and the xammp.users file you just located. That should restore access to the 'XAMPP' Welcome page -
Also check if phpMyAdmin wants a password.
There's no question at this point what happened - someone ran the security script.