Visibility of context menu item based on extension of selected file

[k5tQp2ET]

I added new item to context menu, and I want to make it visible only for specific type of file .e.g. .txt, .dds, .ini,

[RubicBG]

find='.txt|.dds|.ini' - the simplest way, works 99% of the situations
or
where=(sel.file.ext=='.txt' or sel.file.ext=='.dds')
or
where=str.contains('.txt|.dds|.ini|', sel.file.ext+'|')

[k5tQp2ET]

Thank you.