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NOTE:
Computable Document Format (CDF) is a legacy document type, superseded by Wolfram Notebooks.

Wolfram Player only supports Wolfram CDF (.cdf) files. A few other file formats also use the .cdf extension. Those cannot be opened using Wolfram Player.

Attempting to open a non-Wolfram .cdf file will trigger the general warning message “This file is not a Wolfram CDF file and cannot be opened by the notebook front end.” In the instance of a non-Wolfram CDF file, it is not actually possible to enable additional capabilities.

To verify your .cdf file is of the Wolfram CDF format, open the file in a text editor and verify that it has the following Content-type line at the top of the file:

(* Content-type: application/vnd.wolfram.cdf.text *)

(*** Wolfram CDF File ***)
(* http://www.wolfram.com/cdf *)

(* CreatedBy='Mathematica 14.0' *)

(***************************************************************************)
(*                                                                         *)
(*                                                                         *)
(*  Under the Wolfram FreeCDF terms of use, this file and its content are  *)
(*  bound by the Creative Commons BY-SA Attribution-ShareAlike license.    *)
(*                                                                         *)
(*        For additional information concerning CDF licensing, see:        *)
(*                                                                         *)
(*         www.wolfram.com/cdf/adopting-cdf/licensing-options.html         *)
(*                                                                         *)
(*                                                                         *)
(***************************************************************************)

If your .cdf file contains this Content-type line but still does not open in Wolfram Player, please contact Technical Support.