* At some point, you close the editing program, and theoretically, Evernote can then recognize that the program is done with the temporary copy, and can therefore delete it * Evernote notices that the temporary copy of the attachment has changed, and pulls it in to your notes database * You edit the attachment, and when you're done, you Save it (not Save As) * Evernote then triggers the program that's configured (either by the OS, or by your choice) to edit the attachment, and points the program at the temporary copy in the attachments folder This is a temporary copy of your attachment. * Evernote retrieves the attachment from your notes database, and writes it out as a file in your attachments folder. * You double-click on an attachment, or right-click 'Open WIth.' and pick a program The attachments folder in Evernote for WIndows holds temporary copies of attachments while you are editing. I'm not sure that last file's version is opened with note opening

I mean 1-2-3-4 versions of the same file.

I have multi-saved files in Evernote attachments folder.

Evernote windows not saving attachments