.htaccess trouble

hey guys;

i've been sitting on this topic for 2 days in a row and after trying just everything i could find with G., it's driving me nuts, possibly anyone can help me out?

my trouble is- i got a page which is heavy linked by users, and i have received many wrong links, which destroy me in GWT - my site has only .html extension pages, and people link to non existing .htm, or misspell the link so i get .html%22, or .html). - so far i have counted 22 different extensions.

Does any of you know a way to redirect those sick URLs to corresponding .html files?
I can't put all those links to make them 301 in htacces - since there's abt. 3000 of them, so the only solution is to make a set of rules for redirecting, but nothing works for me so far

Help anybody?
Please?

You can use wildcards to make the process easier and better for you to manage.

Just google "301 redirect wildcards" and there'll be lots, the 1st result for me was:

http://www.seomoz.org/q/301-redirect-wildcard-question

yes, wildcard is an option, but problem is i hava a page with 30k visitors/day, and IT "geeks" who "have not enough time to do it, and firstly have to study >howto's<", so it will take a month or so translating to english and still might not work or even fuck up the page for a few secs, tahts why i try to fing somthing in htaccess

You need to use regex to make an expression that covers everything.