| rx | Borland Reflex Database Driver |
| rxdoc | iZotope RX Document |
| rxf | Resco Explorer Encrypted File |
| rxh | Borland Reflex Database Help Data |
| rxn | MDL Reaction Format Data |
| rxr | Borland Reflex Database Report Data |
| rxw | eXtendable Wad Editor RXW Data |
| rzk | Red Zion Key |
| rzlayer | YouTube Movie Maker Layer Data |
| rzlrc | YouTube Movie Maker Lyrics Data |
| rzmmpt | YouTube Movie Maker Template |
| rzs | Red Zion Security Data |
| rzsf | YouTube Movie Maker Shapes Data |
| rzw | Microsoft Outlook E-Mail Rules Data |
| rzx | Red Zion File Crypt Encrypted Data |
| rzx | Fuse Input Recording Data |
| s | Thunderbird Saved Passwords Data |
| s01 | MicroStation Modification Site Resource File |
| s02 | MicroStation Modification Site Resource File |
| s03 | MicroStation Modification Site Resource File |
| s04 | MicroStation Modification Site Resource File |
| s05 | MicroStation Modification Site Resource File |
| s06 | MicroStation Modification Site Resource File |
| s07 | MicroStation Modification Site Resource File |
| s08 | MicroStation Modification Site Resource File |
| s09 | MicroStation Modification Site Resource File |
| s10 | MicroStation Modification Site Resource File |
| s10w | S10 WebAlbums Settings Data |
| s12 | WISO Steuer-Sparbuch 2012 Data |
| s19 | Motorola S-record Data |
| s1p | EEsof Touchstone File |
| s1y | Yamaha EX5 Internal Performance Data |
| s2d | ADS S-parameter Data |
| s2db | SQLite 2.0 Database |
| s2p | EEsof Touchstone File |