Hi Monia Mehersi,
and welcome to our forums
Your knowledge of English is great ..well done!
I downloaded your excel file opened it, entered some data into the second worksheet labelled " Combinaisons 3 matchs" and it opened fine without any need to enter a password, I then saved the file ( with the test data) under a slightly different name with no problems.
It makes me wonder therefore if there is a problem with your installation of Excel...?
May be it would be wise to ask a friend who also has Microsoft Excel on their computer if they can also open the workbooks and edit them without having to provide a password
More information here:
Fortunately there was no password protection on the file your submitted....
I hope this helps you