When I try to build a new custom device with the Custom Device Template Tool it creates four files:
Trying to open the Custom Device.lvlib an Error shows up: "Projekt- oder Bibliotheksdatei ist beschädigt.".
Translated: Project or Library file is corrupt.
I am using german EV. Versions of VeriStand and LabVIEW
I could not reproduce the behaviour by use of LV 2009 SP1 German and VeriStand 2009. So, maybe something went wrong with the installation on your system. Please post back if you still encounter this error.