I am a bit confused about what is the meaning of having a FASTA format file. If I download the sequence of a genome from NCBI by choosing the options "Send to">"Coding Sequences">"Format:FASTA Nucleotide", I obtain a file in which I have the sequences of the genes and each one starts with a ">" and the description.
It should be a FASTA format file in this way, right ? But, actually, this file that I download is a txt file ... So how should I consider it ? The organization in the file is like a FASTA format file but the file is a txt file. What can I do to have a real FASTA format file ?
Sorry if my question could be trivial but I am pretty new in this field. Thank you in advance.
P.s. I am on Windows 10 and not on Linux.