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This is a great question u/Rubiks-Grandson-7051!
The [Monero GUI](https://www.getmonero.org/) can uniquely generate a [25 word recovery phrase](https://github.com/LedgerHQ/app-monero/tree/master/tools/python) that is used to access XMR in the case that the physical Ledger device is lost, but a user needs to access their funds in an emergency *using the* *Monero GUI*. This process utilizes the private keys (24 word recovery phrase) of a user and converts them into the Monero GUI format of a 25 word recovery phrase.
In this manner, the 24 word recovery phrases can be converted into Monero GUI-specific 25 word recovery phrases (these are deterministically derived from each unique 24 word recovery phrase).
Importantly, once this process is completed, the private key has been exposed to the internet and should be considered as no longer secure with absolute certainty.
Only the Monero GUI utilizes this type of 25 word recovery phrase conversion model.
Alternatively, if you’re looking to utilize an optional [25th word passphrase](https://www.ledger.com/academy/passphrase-an-advanced-security-feature), this would be completely separate and different than this Monero GUI 25 word recovery phrase that you initially reached out about.