Code:

{

First we create a temporary file and call the

function FindExecutable to get the associated Application.

}

function GetAppName(Doc: string): string;

var

FN, DN, RES: array[0..255] of char;

begin

StrPCopy(FN, DOC);

DN[0]  := #0;

RES[0] := #0;

FindExecutable(FN, DN, RES);

Result := StrPas(RES);

end;

function GetTempFile(const Extension: string): string;

var

Buffer: array[0..MAX_PATH] of char;

aFile: string;

begin

GetTempPath(SizeOf(Buffer) - 1, Buffer);

GetTempFileName(Buffer, 'TMP', 0, Buffer);

SetString(aFile, Buffer, StrLen(Buffer));

Result := ChangeFileExt(aFile, Extension);

end;

procedure TForm1.Button1Click(Sender: TObject);

var

f: System.Text;

temp: string;

begin

// get a unique temporary file name

// eine eindeutige Temporare Datei bekommen

temp := GetTempFile('.htm');

// Create the file

// Datei erstellen

AssignFile(f, temp);

rewrite(f);

closefile(f);

// Show the path to the browser

// Pfad + Programmname zum Browser anzeigen.

ShowMessage(GetAppName(temp));

// Finally delete the temporary file

// Temporaare Datei wieder loschen

Erase(f);

end;

Code:

//Using the Registry:

//************************************************

uses

Registry;

procedure TForm1.Button1Click(Sender: TObject);

var

Reg: TRegistry;

KeyName: string;

ValueStr: string;

begin

Reg := TRegistry.Create;

try

   Reg.RootKey := HKEY_CLASSES_ROOT;

   KeyName     := 'htmlfile\shell\open\command';

   if Reg.OpenKey(KeyName, False) then

   begin

     ValueStr := Reg.ReadString('');

     Reg.CloseKey;

     ShowMessage(ValueStr);

   end

   else

     ShowMessage('There is nоt a default browser');

finally

   Reg.Free;

end;

end;

Code:

//************************************************

{Copyright (c) by Code Central}

type

TBrowserInformation = record

   Name: string;

   Path: string;

   Version: string;

end;

function LongPathName(ShortPathName: string): string;

var

PIDL: PItemIDList;

Desktop: IShellFolder;

WidePathName: WideString;

AnsiPathName: AnsiString;

begin

Result := ShortPathName;

if Succeeded(SHGetDesktopFolder(Desktop)) then

begin

   WidePathName := ShortPathName;

   if Succeeded(Desktop.ParseDisplayName(0, nil, PWideChar(WidePathName),

     ULONG(nil^), PIDL, ULONG(nil^))) then

     try

       SetLength(AnsiPathName, MAX_PATH);

       SHGetPathFromIDList(PIDL, PChar(AnsiPathName));

       Result := PChar(AnsiPathName);

     finally

       CoTaskMemFree(PIDL);

     end;

end;

end;

function GetDefaultBrowser: TBrowserInformation;

var

tmp: PChar;

res: LPTSTR;

Version: Pointer;

VersionInformation: Pointer;

VersionInformationSize: Integer;

Dummy: DWORD;

begin

tmp := StrAlloc(255);

res := StrAlloc(255);

Version := nil;

try

   GetTempPath(255, tmp);

   if FileCreate(tmp + 'htmpl.htm') <> -1 then

   begin

     if FindExecutable('htmpl.htm', tmp, res) > 32 then

     begin

       Result.Name := ExtractFileName(res);

       Result.Path := LongPathName(ExtractFilePath(res));

       // Try to determine the Browser Version

       VersionInformationSize := GetFileVersionInfoSize(Res, Dummy);

       if VersionInformationSize > 0 then

       begin

         GetMem(VersionInformation, VersionInformationSize);

         GetFileVersionInfo(Res, 0, VersionInformationSize, VersionInformation);

         VerQueryValue(VersionInformation, ('StringFileInfo040904E4ProductVersion'),

           Pointer(Version), Dummy);

         if Version <> nil then

           Result.Version := PChar(Version);

         FreeMem(VersionInformation);

       end;

     end

     else

       ShowMessage('Cannot determine the executable.');

     SysUtils.DeleteFile(tmp + 'htmpl.htm');

   end

   else

     ShowMessage('Cannot create temporary file.');

finally

   StrDispose(tmp);

   StrDispose(res);

end;

end;