I have solved my problem.
Moodledata folder was in a "private" folder (private folder is in the same level than httpdocs or html_public, it depends of your hosting service).
For solving my problem I have created a subdomain (http://www.moodle.laquimicafacil.es). Moodle y moodledata folders must be in the folder created for the subdomain (in my case "site1").
After migrating moodle and moodledata folders to the subdomain I´ve had to modify config.php
Now Hotpotatoes scorm 1.2 and any scorm (exe, Camptasia...) runs fine because the new folder (site1 for my subdomain) isn´t private.