Ok, it looks like startR changes the relative file path. So 
...
$R->startR;
open FH, ">", "c:/scripts/test2.txt" or die $!;
...

[download]
works fine (for me, the relative path goes to the directory "C:/Program Files/R/R-2.8.1/Statistics-R/"). I think relative path issues are discussed elsewhere. My workaround is: 
#!/usr/bin/perl
use warnings;
use strict;
use Cwd;
use Statistics::R;

my $currentdir = cwd();
my $R = Statistics::R->new();
open FH, ">", "test1.txt" or die $!;

$R->startR;
$R->stopR;

chdir($currentdir);
open FH, ">", "test2.txt" or die $!;

[download]
Note: I didn't actually need to open a file while communicating with R, but that wouldn't be hard to do. Thank you again.

In reply to Re^3: in Statistics::R, startR breaks open by untitled
in thread in Statistics::R, startR breaks open by untitled

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