Associate This

Associate This was designed as a file extension manager that works in background, to protect your system from software that changes your file associations.
Here are some key features of "Associate This":
ï¿­ Watches for changes to your file associations.
ï¿­ Allows you to block changes to all associations or configure individual extensions on a case-by-case basis.
ï¿­ Gives you control over when and how you are notified of changes (or attempted changes) to associations.
ï¿­ Lets you re-open the last file you worked with using the program of your choice.
ï¿­ Offers integration with Windows so you can launch any file from Windows Explorer (or another file management program) and then select the program in which you want to view it from a pop-up menu.
ï¿­ Allows you to configure Associate This to always ask which program to use with a particular file extension. (This feature is indispensable for designers of web pages and other multimedia content that must be compatible with a variety of web browsers and media players.)
Limitations:
ï¿­ 30 days trial.