Inno Setup Get default browser

Question

I have a software which requires the default browser installed on user computer.

Is there a way that I can get it?

Thanks

Answer 1

An solution that correctly works on modern versions of Windows cannot be based on association with http protocol, as that's no longer reliable. It should rather be based on a solution like the answer by @GregT to How to determine the Windows default browser (at the top of the start menu).

So something like:

function GetBrowserCommand: string;
var
  UserChoiceKey: string;
  HtmlProgId: string;
begin
  UserChoiceKey :=
    'Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.html\UserChoice';
  if RegQueryStringValue(HKCU, UserChoiceKey, 'ProgId', HtmlProgId) then
  begin
    Log(Format('ProgID to registered for .html is [%s].', [HtmlProgId]));
    if RegQueryStringValue(HKCR, HtmlProgId + '\shell\open\command', '', Result) then
    begin
      Log(Format('Command for ProgID [%s] is [%s].', [HtmlProgId, Result]));
    end;
  end;

  { Fallback for old version of Windows }
  if Result = '' then
  begin
    if RegQueryStringValue(HKCR, 'http\shell\open\command', '', Result) then
    begin
      Log(Format('Command registered for http: [%s].', [Result]));
    end;
  end;
end;

---

If you want to extract browser path from the command, use a code like:

function ExtractProgramPath(Command: string): string;
var
  P: Integer;
begin
  if Copy(Command, 1, 1) = '"' then
  begin
    Delete(Command, 1, 1);
    P := Pos('"', Command);
  end
    else P := 0;

  if P = 0 then
  begin
    P := Pos(' ', Command);
  end;
  Result := Copy(Command, 1, P - 1);
end;

(based on Executing UninstallString in Inno Setup)