Disabled richtextbox control in excel sheets
 

I use Microdsoft RichTextBox control for some special word analyzing function
in excel sheets, but yesterday I was able to load and inserted this plugin
no more. I realized a couple of weeks ago that an XP security update
(KB918899) forbids the use of the richtextbox, but a day ago this known patch
was not installed on my computer. Are there any possibilities to gain back
these control?