Animate not responding

Hi,
I made an animation in which I used many bitmaps on which I used classic interpolations (I didn't know it was not recommended).
The changes were taking longer and longer to load onto my file until I couldn't even open my file.
Now when I try to open my file, "Animate is not responding"; I think it's a computer performance issue.

I haven't made any saves throughout the project (I will now) and can't open the file with Animate to reduce it.

So my question :
Do you have an idea to lighten it without opening it via Animate?
I found that we could replace the extension .fla in .rar to see what the file contained (photos 1 and 2) but I cannot manage to remove the interpolations this way nor the bitmaps without corrupting the file.

Ps: I set my performance to high, redownload animate, it doesn't change anything

Thank You !