I don’t really know how to legally get the files . The format is not precisely new and was popular when dictionaries had a CD-ROM version… I would guess apps are the way now, but sadly those aren’t as efficiently integrated with an Anki routine
I was searching ways to make monolingual sentence cards some time ago and I found about the qolibry program; in the same youtube video there were links for both the qolibry viewer program and a huge file with dictionaries.
The dictionaries in EPWING format aren’t exactly new (most were published around 2003-2004) . I was looking for some new version for the ones I used the most, but no luck there. Either the websites of the publishers were very hard to understand (been in japanese an all… ) or they were selling the old versions as well (specially in Amazon) and no option for overseas shipping.