how can I open a *.dbl file?

From Zorro manual:

*.dbl file consists of a double array containing the daily balance or equity values

the equity or balance curves from test or training are exported to a *.dbl file and can be further evaluated with third party software, f.i. an R data analysis package

I would like to inspect what data does the *.dbl file really have. Does anybody know how can I open it? I could not open it with R studio.
Just would like to inspect the file first.
Thank you
Sinuhet

You can just directly read it in a double array. In C, use fread() or file_read(), in R I believe it's readBin(), or use read.csv() with the .csv balance curve.