Hello Mahtan, and welcome to Vista Forums.
In order to help, we need to know exactly what file extension types are not associated correctly.
From your last comment, it appears that the .exe
file extensions are not associated correctly for that. At the link below, click on the .exe option in the table box to download the .reg file. After downloading it, right click on the .reg file and clock on Merge
and approve. This will restore the default .exe file extensions association.
Hope this helps,