>Someone can suggest me a way to recover a memo file invalid without loosing data ?

I had this: https://www.levelextreme.com/Home/ShowHeader?Activator=17&ID=9264

It's not for the faint of heart, and it needs a sample of healthy tables to build the code from, and even then it probably won't return everything, you'll probably lose something around the place where it broke. But it should get the job done. Make sure you understand what it's doing before you start asking questions - note that this is 24 years old, so it's probably not going to work with any of the modern field types (integer, datetime)...

Here, attached a newer version, last update 2003...