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A file with the .KML file extension is a Keyhole Markup Language file. KML files use XML to express geographic annotation and visualization by storing locations, image overlays, video links, and modeling information like lines, shapes, 3D images, and points.

Various geospatial software programs use KML files since the purpose is to put the data into a format that other programs and web services can easily use. This included Keyhole Earth Viewer from Keyhole, Inc. before Google acquired the company in 2004 and started using the format with Google Earth.

Google Earth was the first program to be able to view and edit KML files, and it's still one of the most popular ways to open them online. With the web page open, use the Projects menu item (the pin/map icon) to load a KML file from your computer or Google Drive account.

ArcGIS, Merkaartor, Blender (with the Google Earth Importer plug-in), Global Mapper, and Marble can open KML files as well.

You can import a KML file directly into Google Maps too. This is done through your Google My Maps page when adding content to a new map layer. With the map open, choose Import within any layer to load a KML file from your computer or Google Drive. You can make a new layer with the Add layer button.

You can open KML files with any text editor, too, since they're really just plain text XML files. You can use any text editor, like Notepad in Windows or one from this free text editors list. However, doing this will just let you see the text version, which includes coordinates and possibly image references, camera tilt angles, timestamps, etc.

If you're using the desktop version of Google Earth, right-click the item in the Places section that corresponds to the KML file you opened and that you want to convert to KMZ. Choose Save Place As, and change the Save as type format to KMZ.

To save a KML file to an ESRI Shapefile (.SHP), GeoJSON, CSV, or GPX file, you can use the MyGeodata Converter website. Another KML to CSV converter can be had at ConvertCSV.com. The Filestar desktop KML converter also supports export formats like GDB, GEOJSON, OSM, and TAB.

To convert a KML file to an ArcGIS layer, follow that link for more information.

You don't have to do a conversion if you want to convert your KML file to XML. Since the format is XML (the file is just using the .KML file extension), you can rename .KML to .XML to have it open in your XML viewer.

KMZ and ETA files are both Google Earth Placemark files. However, KMZ files are just ZIP files containing a KML file and other resources, like images, icons, models, overlays, etc. Earth Viewer and early versions of Google Earth used ETA files.

As of 2008, KML has been part of an international standard of the Open Geospatial Consortium, Inc. The full KML specification can be seen on Google's KML Reference page.

You might be misreading the file extension if you still can't get your file to open or convert with the programs mentioned above. It's possible that you're dealing with a file that has nothing to do with the KML format.

Another interchangeable geography data format is Geography Markup Language, but they use a similarly spelled .GML file extension.

KMR files are not related at all and are KnowledgeMill Link files used by the Microsoft Outlook KnowledgeMill Filer plug-in.

Another file format you might be confusing with KML is Korg Trinity/Triton Keymap or Mario Kart Wii Course Description, both of which use the .KMP file extension and open with FMJ-Software's Awave Studio and KMP Modifier, respectively.

LMK files are also different. They are Sothink Logo Maker Image files that you can open with Logo Maker from Sothink.

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