I am very new to bioinformatics and I apologize if this question is simple/obvious.
My goal is to perform a polygenic risk score analysis however I am having trouble with the preprocessing of my data.
I downloaded a dataset with FAM, BIM, and BED files. I want to use plink to convert these files to a PED file however I believe the .BED file is a Browser Extensible Data as seen in the UCSC FAQ (https://genome.ucsc.edu/FAQ/FAQformat.html#format1) and not the desired .bed (PLINK 1 binary biallelic genotype table).
My questions are;
How can you distinguish between these two file formats? Is it simply the capitalization of the suffix .bed vs .BED?
What tools can I use to convert the BED/FAM/BIM files to the desired PED file format?