Question about cdf files

Hello, everyone
I am using the files in the Preprocessing_tools folder in crocotools to make the initial field and boundary field files. But I have a problem, the input file in there is required to be in cdf format, and the soda and woa data I downloaded are in nc format. Is there any program in the folder that converts or makes between the two?

cdf is just an older file extension for NetCDF files, there is no need of conversion.

To add to this (in case anybody else if having issues), I have come across some applications that will refuse to read netcdf files if they have a .cdf extension, but you can solve this by just changing the file extension to .nc