About Win 7 file association and open method

because of the need to analyze the source of a message, because you are used to using Office Outook to view mail attribute information, and the current system default mail program is Windows Live Mail, so Use "Open with" to specify that the message is opened by Office Outlook, but when you specify the open method, you will not be able to remove the "Always use the selected program to open this file" check result.

And after this operation is executed, Office Outlook does not open the correct mail file (.eml type) correctly. Now it can only restore the previous state first. According to the experience of using Windows XP in the past, the folder option ” can set the file key and open mode, but under Windows 7 gOxiA is confused! Looking for a long time did not find, because it is the reason of the RC version in the help system is difficult to find relevant information, at least through a few Keywords cannot be searched for related help windows7 system download. But I am sure that the system will have a place to set up, which reminds me of the control panel