How can I get the extensions of the attachment from SPDataTable?

How can I get the extensions of the attachment from SPDataTable like below?
image
image
I would like to set the validation that applicant can attach pdf only.

Please help.

Hello @itapps,

I addressed this question to the developers and am waiting for their answer.

@itapps,

Thank you for waiting!

There is no functionality for restricting the upload of specific file types using the List or Library controls, but we can offer paid support to add it. If you are interested, please email us at [email protected].

oh.. Thank you
I will contact them if needed.