The list is long:
core.php in system/preloads
admin.php in system
main.php in system/class/typeof
theme_name.php
If I have to change version of the libraries are forced to rewrite them in the theme or template file theme_name.php
However, we are unable now to figure out where it is continuously uploaded the file jquery.js after viewing many files.
There should be a more precise order in this regard.
I hope this in xoops 2.6.0 we will not experience these conflicts between versions, because I noticed that some objects do not work if there is a conflict like this.