Creating app which opens a custom file extension

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I think you need to do that type of customization via intent-filter something like:

<intent-filter android:icon="your_drawable-resource"
               android:label="your_string_resource"
               android:priority="integer"> 
    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:scheme="file" />
    <data android:host="*" />
    <data android:pathPattern=".*\\.YOUR_CUSTOM_FILE_EXTENSION" />
</intent-filter>

Also you should look:

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