[SOLVED] Windows: This file does not have a program associated with it for performing this action

I messed up with my regestry under Windows 7 and now a getting an error while I am trying to launch explorer.exe.

"This file does not have a program associated with it for performing this action"

or in german
"Der Datei ist kein Programm zum Ausführen dieser Aktion zugeordnet. Installieren Sie ein entsprechendes Programm, oder erstellen Sie in der Systemsteuerung unter "Standardprogramme" eine Zuordnung, wenn bereits ein Programm installiert ist."
Here is the solution:

copy this lines below into a txt file then rename it to *.reg and double click to add this information to your registry

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Folder\shell\opennewprocess\command]
"DelegateExecute"="{11dbb47c-a525-400b-9e80-a54615a090c0}"

[HKEY_CLASSES_ROOT\Folder\shell\opennewwindow\command]
"DelegateExecute"="{11dbb47c-a525-400b-9e80-a54615a090c0}"

[HKEY_CLASSES_ROOT\opensearchfilefolderresult\shell\open\command]
@=""
"DelegateExecute"="{99969a8f-27e6-4adf-ab9f-b5b5e90d4733}"

[HKEY_CLASSES_ROOT\Folder\shell\explore\command]
"DelegateExecute"="{11dbb47c-a525-400b-9e80-a54615a090c0}"

[HKEY_CLASSES_ROOT\WMP11.AssocFile.m3u\shell\Enqueue\command]
"DelegateExecute"="{45597c98-80f6-4549-84ff-752cf55e2d29}"

Source: sevenforums.com