[R] reading data

[Margarida Júlia Rodrigues Igreja]

Hello,
I´m trying to read data from a text file but i can´t

When i print:
 > a<-read.table(file="C:/dados10.txt")

The next error appears:
Error in file(file, "r") : unable to open connection
In addition: Warning message:
cannot open file `C:/dados10.txt'
  Can you help me?

Margarida

PS:The operating sistem i´m using is Unix