The stored procedure had a different schema from dbo, making it inaccessible from the account used to work with SQL.
The following will add the correct stored procedure. Make sure:
USE [Symantec_CMDB]
GO
/****** Object: StoredProcedure [dbo].[spGetAllExecutableFiles] Script Date: 12/10/2018 11:15:45 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[spGetAllExecutableFiles]
AS
BEGIN
SELECT r.Guid, r.Name, wf.FileVersionString
FROM dbo.[RM_ResourceFile] r
join Inv_Windows_File wf on wf._ResourceGuid = r.Guid
where LOWER(r.Name) LIKE '%.exe'
END
GO