stsadm –o blockedfilelist –extension .exe –delete
and received an Operation Successful result. Great! You can now upload .exe files to your SharePoint. You think that you can do this but… SharePoint doesn’t allow this upload. Strange! Operation successfully completed isn’t it?
In fact, it succeed but didn’t act as expected. You authorized .exe upload file to the Central Administration instance and not your content site.
To correct this, you just have to add an url parameter and specify your SharePoint instance:
stsadm –o blockedfilelist –extension .exe –delete –url http://servername