I have made a small AutoIt script which checks in the registry where to find the OLK temporary folder and then opens it. You can download the script here (zipped EXE file; AutoIt source code is not included).
More info about the Outlook Temporary folder, with a clear explanation can be found on groovypost.com.
Allison said
Oh my god, thank you for this file! I have been looking for that stupid little OLK folder forever and this has been the only thing that’s been able to help me! I found it through Groovypost’s wonderful forums on Outlook and the OLK folder. Thank you, thank you, thank you for this app!!