The commands on the File menu should be fairly obvious, really.
New
Open
Close
Save
Save As
Save Copy
Export Bookmarks
Import Bookmarks
Exit
Creates a new, empty document containing one byte whose value is 0.
Reads in a file from disk. What did you expect it to do?
When a document is closed, you will be prompted to save it if you have
performed any operations on the actual bytes.
When you save a document back to the same filename you opened it from,
you are asked whether or not you really want to overwrite the file.
What you'd expect.
Writes the document to disk, leaving the filename associated with the
document unchanged. This is useful for making backups as you work.
Writes the bookmarks in the current document out into a text
file (default extension *.bmk).
Reads a bookmark file into the current document. Previously existing
bookmarks are deleted.
Exits from A.X.E., prompting to save any changed documents.