Android Question What to do with "Unknown" extension

[boten]

My app shows a list of file names.
Clicking on a file name shows the file, offering the suitable app (Open With)
The code for doing this (as shown by Erel) is:

Sub File_Intent(Dir As String,Fn As String)
    File.Copy(Dir, Fn, shared, Fn)
    Dim in As Intent
    in.Initialize(in.ACTION_VIEW, CreateFileProviderUri(shared, Fn))
    in.Flags = 1
    StartActivity(in)
End Sub

Sub CreateFileProviderUri (Dir As String, FileName As String) As Object
    Dim FileProvider As JavaObject
    Dim context As JavaObject
    context.InitializeContext
    FileProvider.InitializeStatic("android.support.v4.content.FileProvider")
    Dim f As JavaObject
    f.InitializeNewInstance("java.io.File", Array(Dir, FileName))
    Return FileProvider.RunMethod("getUriForFile", Array(context, Application.PackageName & ".provider", f))
End Sub

It works fine.
pictures (.jpg .gif ) are offered Gallery (and more apps)
texts (.txt .log) are offered a choice of text editors
web pages (.html) are offered a chice of browsers (and text editors)
.pdf are offered PDF viewers
and so on with "well established" extensions

The problem is with "unregistered" extension.
I have files with strange extensions (some are created by me) like .hst .rec .123 .xyz etc...
Since there is no app associated with them, another app is invoked (in my case some game installed)

My question is:
Is there a way to determine if there is NO app associated with that extension, so I ignore the "file intent".
It is possible to store all "known" extensions in the prog - BUT this does not cater for an "new" extension associated with an app.

 

[Erel]

(as shown by Erel

No. Whenever you find it, you should also see a bold message that says that you should use FileProvider class instead.

 

[boten]

OK, but that still does not answer my question about "unregistered" extensions