: The web-based interface that allows administrators to configure the device without using a Command Line Interface (CLI).
Use the archive download-sw command. This is preferred over a simple copy because it extracts the .tar file and installs the web interface simultaneously.
The string appears to follow the naming convention for a Cisco wireless access point firmware or recovery image (specifically for the Aironet 1600, 2600, 3600, and 1700/2700 series APs that run the "AP1G2" image type).