I can't speak for others, but even though I recently purchased Calendar Creator 12.2 I would gladly purchase a 12.3 version if it contained an UPDATED (next 10-years or more) moon phase database, and add the option to have the program open in whatever "zoom" it was at when closed.
Except for those two issues, I'm very happy to see the new Calendar Creator version (12.2) that works with Windows 10. Everything else seems to be working properly including importing older files created in previous versions.
P.S. It would be icing on the cake if the 12.3 version had the option to use a moon phase "GRAPHIC" like most modern calendars do instead of the current displaying of the WORDS "Full", "First Quarter" etc.
My guess is that .csv would be the format to use, since that's a format that Calendar Creator can import and export. If I were doing it, I would collect the data in a spreadsheet (Excel or similar) and provide that to the developers. They can save it as .csv if that's what they'll use before a conversion to .bcc. If you're going to offer a moon phase calendar, you might want to submit a sample to Encore before putting a lot of work into it, and let them test it to be sure it's what they want for conversion.
I recall at one time having searched online for a .csv moon phase calendar that could be imported into Calendar Creator, but had no success in finding one.
I also found numerous online moon phase calculators, none of which provided any type of bulk data suitable for import into CC.
I used some code from Github to write a PHP script which calculates the four moon phases between any two dates occurring before (at least) 2038. I can code the program to create a .csv file if someone would provide the fields necessary, their format and order.
For the fields, you can export a calendar to .csv, and that will show the fields that CC uses.
You might want to search the CC forums for threads on importing and exporting. There are various things to take into consideration (fields may have to be filled, numeric/date data may need to be formatted in specific ways, etc.).
There has not been expert guidance on this from Encore as long as I've been using Calendar Creator, and my own efforts haven't been successful in importing data from sources other than exported CC .bcc files.
You might have a look at these past threads. They might provide some leads:
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