I've checked ruby-talk emails regarding Dir.glob and File.join but
didn't see this one reported before.

C:\> ruby --version
ruby 1.8.5 (2006-12-25 patchlevel 12) [i386-mswin32]

C:\> irb
irb(main):001:0> Dir.glob(File.join(ENV['USERPROFILE'], '*.rnd'))
=> [C:\\Documents and Settings\\yura/putty.rnd"]

C:\> ruby --version
ruby 1.8.6 (2007-03-13 patchlevel 0) [i386-mswin32]

C:\> irb
irb(main):001:0> Dir.glob(File.join(ENV['USERPROFILE'], '*.rnd'))
=> []


-- 
yura