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Application associated with a specific file name extension

To determine which application is associated with a specific file name extension you can look in the registry under HKEY_CLASSES_ROOT.

Easier is to use the Windows API function FindExecutable() - see the following example.
The code shows the fully qualified associated application or the last error (using GetLastError).

program Project1;
   Forms, Dialogs, ShellAPI, SysUtils, Windows;
 {$R *.RES}
   sApp : array [0..256] of char;
   // this should return something like c:\program files\office\excel.exe

   if FindExecutable('c:\temp\xxx.xls', nil, sApp) >= 32 then
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Generated 20:03:32 on Oct 17, 2018