I googled a bit longer and found some solutions that helped here. this regestry-file added sublime to my context menu:
[code]Windows Registry Editor Version 5.00
; This will make it appear when you right click ON a folder
; The “Icon” line can be removed if you don’t want the icon to appear
[HKEY_CLASSES_ROOT\Directory\shell\sublime]
@=“Open Folder as &Sublime Project”
“Icon”="“C:\Program Files\Sublime Text 2\sublime_text.exe”,0"
[HKEY_CLASSES_ROOT\Directory\shell\sublime\command]
@="“C:\Program Files\Sublime Text 2\sublime_text.exe” “%1"”
; This will make it appear when you right click INSIDE a folder
; The “Icon” line can be removed if you don’t want the icon to appear
[HKEY_CLASSES_ROOT\Directory\Background\shell\sublime]
@=“Open Folder as &Sublime Project”
“Icon”="“C:\Program Files\Sublime Text 2\sublime_text.exe”,0"
[HKEY_CLASSES_ROOT\Directory\Background\shell\sublime\command]
@="“C:\Program Files\Sublime Text 2\sublime_text.exe” “%V”"[/code]
Hope it also will help somebody.
Best regards
Andi