How can I make another application the default handler of a mapping file extension (e.g., “KMZ”)?
The automatic handling of a file extension is controlled by Windows Explorer. To change this, open an Explorer window (any one will do) and select Tools…Folder Options. Click the File Types tab, then scroll down to the file extension (e.g., “KMZ”). Select this and click the Change button. A pop-up window will appear. The application you want will probably already be shown in the list below, in which case you should select this and click OK. If not, you can find it by selecting the Browse button and finding the application.
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