ETA

Keyhole EarthViewer placemark or overlay data
File type: GIS, GPS navigation and map file
An eta file extension is related to the Google Earth and used for its placemark and overlay files.
Found 2 different file type records with the same eta filename suffix.
What is eta file?
File type category:
GIS, GPS navigation and map file
Date updated: September 5, 2017
The eta file extension is associated with Keyhole EarthViewer, earlier version of Google Earth.
The eta file extension is used for two different formats - A placemark file format and an overlay file format.
When Google acquired Keyhole and renamed the product to Google Earth it also changed the default file extensions to KML (placemark) and KMZ.
Mime types:
application/vnd.google-earth.eta
How to open eta file?
The eta files are used for internal purposes of EarthViewer.
Suggested software to open eta file:
Associated software actions with the eta file
Programs for viewing eta files:
Google Earth (Microsoft Windows)
Google Earth for Mac (Apple macOS / Mac OS X)
eTreppid audio file
File type category:
Audio and sound file
Date updated: June 28, 2011
The ETA file extension is used for eTreppid audio file (eTplayer and ETVC media CODEC).
Probably older and no longer supported auido file format.