-e " " returns true

PerlingTheUK has asked for the wisdom of the Perl Monks concerning the following question:

Hiya,

I have stumbled over a problem in my program. Trying to find the reason I have written the follwing test script::

my $pseudofile = " ";
print "File exists.\n" if ( -e $pseudofile );
[download]

For the following pseudofile - names Perl claimed the file existed:

my $pseudofile = " ";
my $pseudofile = " . . ";
my $pseudofile = " .. ";
my $pseudofile = "             ";
my $pseudofile = " .     ";
[download]

I am not aware of the reason, is this on purpose? Or is this a bug?
I am using Active Perl 5.8.3 and WinXP (MSWin32-x86-multi-thread)

Hans