About file associations and how to open in Win 7

Because work needs to analyze the source of a message, and so on, because you are accustomed to using Office outook to view message property information, and the current system default mail program is Windows Live Mail, so use the open with to specify that Office Outlook open the message, However, when you specify the mode of open, because of negligence, do not remove the "Always use the selected program to open this file," the check results are conceivable.

This operation does not allow Office Outlook to correctly open the Change mail file (. eml type), you can now only restore the previous state, based on the experience of using Windows XP in the folder options to set the file key and open way, but under Windows 7 Goxia is confused! Looking for a long time also did not find, because the RC version of the reason in the help system is difficult to search the relevant information, at least through a few key words can not search to the relevant help Windows7 system download. But be sure the system will have to be set up somewhere, which reminds me of the control Panel