| Secret (Radio Edit) | 3:13 | |
| Secret (Extended Vocal Mix) | 6:26 | |
| Secret (Fiocco Remix) | 5:46 | |
| Baby Boomers | 6:14 | |
| Secret (Jimmy Goldschmitz Outline Mix) | 6:43 | |
| Secret (Extended Instrumental Mix) | 6:26 |
| Title, Format | Label | Cat# | Country | Year | |
|---|---|---|---|---|---|
| Secret (CD, Maxi) | Antler-Subway, EMI Music (Belgium) | AS 5673 CDM, 7243 8 85094 2 8 | Belgium | 1997 | |
| Secret (CD, Single) | Antler-Subway, EMI Music (Belgium) | AS 5673 CDS, 7243 8 85095 2 7 | Belgium | 1997 | |
| Secret (The Remixes) (CD, Maxi) | Dos Or Die Recordings, Sony Music Entertainment (Germany) | DOS 665563 5, 12-665563-19 | Germany | 1998 | |
| Secret (12") | Dos Or Die Recordings | DOS 079 | Germany | 1998 | |
| Secret (12") | Freestyle Records (6) | FS 2007 | Belgium | 1998 | |
| Secret (12") | Orbit-A | NM 9014 MX | Spain | 1998 | |
| Secret (12") | Hot Tracks (3) | SHT 3405-6 | France | 1998 | |
| Secret (12") | Do It Yourself Entertainment | DIY 02-98 | Italy | 1998 | |
| Secret (12", W/Lbl) | Multiply Records | 12MULTY 43P | UK | 1998 | |
| Secret (CD, Maxi) | Dos Or Die Recordings | DOS 665563 2 | Germany | 1998 | |
| Secret (CD, Maxi) | Antler-Subway | 7243 8 86037 2 0 | Netherlands | 1998 | |
| Secret (CD, Maxi) | BMG Ricordi S.p.A. | 74321 57370 2 | Italy | 1998 | |
| Secret (CD, Maxi) | Mega Records | MRCXCD 2903 | Denmark | 1998 | |
| Secret (12", Pic) | Bit Music | 72-357 | Spain | 2004 |
referencing Secret, 12", FS 2007