I have updated my com.KIO4_Terminal.aix extension with more functions with the assets.
For these blocks to work, the app must be installed.
ListAllAssets, get a list from files in assets.
CopyAllAssets, copy all user files from assets to dir in SdCard.
CopyAllAssetsX, copy all files from assets to dir in SdCard.
CopyFromAssets, copy a file from assets to dir in SdCard.
PathFileAssets, get path file in assets when app is installed.
You can download extension from:
http://kio4.com/appinventor/278_extension_shell.htm