I would like to use a relatively old program called MultiGeneBlast (from 2015) to do some work. The database packaged with this software is also from 2015 and since then, I believe there are a lot more bacterial genomes on the ncbi website.
The software has a create your own database (where it downloads genbank files from online and creates a database) but no longer works and only accepts .gbk and .embl files.
I have looked at other methods of downloading genbank files but from the ncbi website I can see the .gbk extension is now .gbff. Could I just download these and change the extension to .gbk or would I likely run into problems?
Furthermore, is there another way I could make this database? I see that in the software code it makes the database files as either .pal or .tar I think.
Sorry if my questions are trivial, any help is muchly appreciated!