Regarding
bin suffix most likely means that at some stage you used filename-encryption off - see docs
Now you changed it to:
Which means that previously saved files can not be read.
In general you can not change encryption parameters and expect that files saved with different ones will work.
If you want to change file names encryption you can do this but you have to migrate all older files to the new scheme. There is plenty of threads on this forum explaining how to do it, e.g.:
In your case where you have things already mixed up I suggest you start from scratch.