Hi,
here is a tool that helps you converting save files from an emulator to the ED64.
it's like always ^^ just a beta version and needs some testing :D

Howto:
after executing, select the save file. now select the filesize to what the file should be extended.
select the needed swapping options and click on "convert file".
Rename the file to your rom-filename except the file-extension.

Hint:
In the most cases you will be fine with the default settings. If it's not working, create a new save-file with the ED64 and compare it with a hexeditor to your converting results, if it somehow matches. ^^
Make sure you use exactly the same rom on the everdrive64 and your emulator.
you can take a look at this boot/save list for the correct save settings.

Features:
byte-swap
word-swap
byte appending
save backup (*.bak)