# HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.tif\OpenWithList

require "win32/registry"

#Win32::Registry::HKEY_CURRENT_USER.open('Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\').each_key do  | name,time | 
#	p name
#end

Win32::Registry::HKEY_CURRENT_USER.open('Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\FileExts\\.pdf').each_key  do | name,wtime | 
	p name
end