New
#11
That is what changing the extension does.
If you change the extension, you change the default properties. Instead of opening with Thunderbird as the default, the file opens with whatever is the default for the extension, or you can change the default program for the extension.
You can open .eml files in any text editor.
Changing the extension automatically modifies the properties. If you find various .eml files somewhere on your disc except in the Thunderbird folder, you can back them up immediately to wherever you like just by selecting them, and "save as".
If you don't want them to open in Thunderbird, just change the file extension to .txt, and you can open them in any text editor, or .html editor or whatever.
You can also specify what programs can open what by using ;
http://defaultprogramseditor.com/
Hmmm... after reading all this through again, I have either missed something, or I fear that for some reason I am unable to grasp what you want to do.
Regards....Mike Connor