you mention c://, so it sounds like you are using windows, but you
also mentioned a tgz file, which is linux specific. Which OS are you
using?
also, you can use the getwd() function to see what directory you are
in, and either set a new working directory with setwd() or write a
path relative to your working directory
eg, if you have the csv file in your c:\ directory under windows, you
can either read.csv('c:/blah.csv', etc) or setwd('c:/') and read.csv
('blah.csv', etc)
> fish.txt
> 4KViewDownload
>
> fish.csv
> 4KViewDownload
>
> importexportfishcode.txt
> 2KViewDownload