Decrypt problem (with wrong password use 1 time)

Hello.

Sorry my english!!

I have a problem decrypting files.

I encrypt files using this password: 12345678.
I try to decrypt using WRONG password: 11111111.
The program look like is decrypting, and the file modification date is changed.
Obviusly the file doesn´t work.
I try to decript again using the correct password.
The program look like is decrypting, and the file modification date is changed.
The files doesn´t work.

So i think that if you try to decrypt one time with a wrong password, you corrupt the file.

I have important files with this problem.
Any way to solve this problem?.