We are having trouble opening the gerber file from the MSP430F55xx 64-Pin target board. We extracted the file "MSP-TS430RGC64USB.brd" from this package: http://www.ti.com/litv/zip/slac374a. When we try to open with Allegro viewer we get the following error:

Is there something wrong with this file, or does it require a specific viewer version?
-Ruben