File Preview for unknown extension

[sk2107]

Hello,

I have some text files which have a specific unknown extension, I set the default open with to Notepad++ thinking that it would be shown in the file preview window but it didn't.

How can I solve this issue?

thank you.

[void]

Using .foo as an example:
From the Start menu, search for: regedit
Right click Registry Editor and click Run as administrator
In the Registry Editor, navigate to:
HKEY_CLASSES_ROOT\.foo
(please make this key if it does not exist -Right click -> New -> Key)
Create a new String Value (right click on the right side -> New -> String Value)
Set the value name to: PerceivedType
Set the value data to: text

[sk2107]

Amazing.

Thanks a lot.

Best Regards