Hi fxsarge,  thanks a lot.  That is exactly what I thought.  What made me ask is that theres a lot of talk about  anti virus apps for Android and I thought I was missing something.

Sent from my Nexus 7 using Tapatalk 2

Thanks. Its not a case of actually playing the .avi files, its the fact that the Nexus media importer software doesn't actually see all the avi files, nor does it see all the .jpg files that are on the stick. I'm just wondering if the software can only see a limited number of files of a particular kind.