Thank's Phiro,

In the 1st I removed the _ (dash of 8) from the files of Max to restore the alphabetical order in the drop-down menu.

I added, in "Scripts.menu.htm" to var allcmd= [ all the names of the scripts that I no longer wanted to see in the drop-down menu.

As the icons of max (subdiv, bridge, etc.) did not work anymore I looked for the file which was the cause, it was "85 SubdivTools.js", on each line, at the end, it was necessary to delete the _ (dash of 8) of file names.

Oops!
Michael, I made my changes in line 11 : var allcmd= ["AddPoint",. But it works (finally now!!...). I guess that's a problem.
See picture.

That's it, I only have the plugins I need (at the moment) appearing in the drop-down menu.