Please Help! File not opening

I accidently made my fla. 20 mg big. Now whenever I open it, it says that I need to allocate more memory to flash, and closes down. Well, I tried installing more memory in my computer (went from 512 mg to 1.5 gigabytes) and it still didn’t work. If anyone knows what to do please help; this ruined a month worth of work!

Thanks in advance,