Using the Add content feature, I am unable to add ArcGIS Layers... Every time I select a layer to add, it give an error and will not import. This feature works fine with Windows XP, but I can't get it to work in Windows 7.
I am having a similar issue. I get the message "Failed to add layer package(s): filename.lyr (Invalid File). I created the layers in ArcMAP 10.1 and I am using ArcGIS Explorer Desktop 1750 (2.0.0.1750).