Maybe you could try deleting the Colx folder in Roaming (After making a copy of your wallet.dat) and reinstalling COLX wallet?

I did this procedure, the same, man, I'm not a noob.
I'm a PhD student, I'm the left guy of this picture: https://blog.iota.org/welcome-olivia-and-paulo-to-iota-research-796ecd683069

And I can prove my balance: https://ibb.co/fV6Cvb

I just open and close the wallet, I did the backup, but this file is corrupted too.

If some dev see this, please send me an email: pfinardi@gmail.com

I don't want loose my money.

The wallet has automated backups. I hope you haven't deleted them.

You can find the here.
"C:\Users\\AppData\Roaming\ColossusCoinXT\backups"

Yes, I don't delete any file/folder, but the backups of this folder doesn't work too. What can I do?