Importing Account Hierarchy

[Code Guru]

I am a long-time user of gnucash. I want to start a brand new gnucash file
with the exact same accounts hierarchy as an old one. I used
File->Export->Export Accounts to supposedly export the accounts from the
existing file. I saved this as "accounts" but the Save As... dialog did not
give the file an automatic extension as I expected. And when I go to
File->Import, there is not "Import Accounts" option. Should I rename my
accounts file with a .qif extension? If not, what extension should I use?
And how do I import the accounts? Or if File->Export->Export Accounts is
incorrect, what should I do instead?

p.s. I am using gnucash 2.2.4 on Windows 7.