UAC Plugin: Can not create example uac_dualmode.nsi

[th_mi]

At the moment I'm playing this the UAC plugin. If I create the uac_dualmode.nsi example I get the followed error:

!system: returned 0
!system: ""C:\Users\xxx\AppData\Local\Temp\nst3384.tmp""
!system: returned 0
File: "C:\Users\xxx\AppData\Local\Temp\nst3384.tmp.un" -> no files found.

The file nst3384.tmp.un really does not exist. I try to create the installer on a Win7 x64 system. What may be the problem?