How will I know what program/Application is associated with a given file extension?

General question: How can I determine what Application is using a certain file extension? Some are well known, such as .doc for MS Word, MS Excel .xls, PDF for Adobe Acrobat. But is there a master list somewhere which is viewable by the general public?
This question came from what I was gettnig low disk space on my hard drive and do some research, and found a group of 5 files with extension. ECW, for a total of almost 50 MB. After trying for a few hours to find on the Web, what type of program may have created these files, I let fall, back up the files on a CD and has deleted and restarted. So far, no bad consequences, but still a little scary.
I think that all software manufacturers should have to register their extensions with MicroSoft, correct? To repeat: is there a list published, or how to find this information in the future?

Alphabetical list of filehttp://filext.com/alphalist.php?extstart=%5ED extensions

Scroll to the end, click on the alphabet to find the extension and program to open with.
e.g. p for pps etc.

t-4-2

Tags: Windows

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