Question:
How can I execute the application that is associated with a file
extension?
Answer:
Use the ShellAPI function ShellExecute().
Example:
uses ShellAPI;
procedure TForm1.Button1Click(Sender: TObject);
var
DocFileName : string;
DocFileDir : string;
begin
DocFileName := 'C:\DownLoad\somefile.htm';
DocFileDir := ExtractFileDir(DocFileName);
ShellExecute(Form1.Handle,
nil,
pChar(DocFileName),
nil,
pChar(DocFileDir),
SW_SHOWNORMAL);
end;