I took a number of unguided images of the 2017 solar eclipse with my Nikon D3100. The images were saved in its "raw" format, which I believe is a .nef file. I'm having a very hard time finding astrophotography image processing software that handles this format. I've found a couple apps that show a list of DSLRs they work with and this model is not listed.
Are there any software applications that can handle this file type?