his page contains the file association fixes for some of the most common file types. The fixes are applicable for Windows® Vista systems only.
http://www.winhelponline.com/articles/105/1/File-association-fixes-for-Windows-Vista.html
Broken EXE Association
Executable (.EXE) files are the programs you run for most tasks on a computer. Now and again someone reports that they have, in error, assigned some other program to the .EXE extension without first establishing a System Restore Point so they can recover from making this error. When that happens little will run on the computer. Instead, when an .EXE file is clicked some program will start and attempt to process that file instead.
http://filext.com/faq/broken_exe_association.php
