I also have a couple of old wallets for ripple, most likely with $0 balance as well, but just in case. These are files that have a long string that starts with:
The file names would be more useful than the first few characters of the contents since most wallets are specific to their wallet file or backup naming scheme.
As for a possible Electrum XRP fork (
most are scams BTW), it can be anything that the owner set without any file name extension, else it's "
default_wallet" or "
wallet_<number>".
You can also ask this in the Alts boards or (
unaffiliated) Alts forum where Ripple users/experts may be present.