45 - 52
-
- 45 - Salt Lake City Game Music File
- 45 - Unknown Apple II File
- 47 - Unknown Apple II File
- 48 - Unknown Apple II File
- 486 - System driver file (486 and above )
- 49 - Unknown Apple II File
- 49 - Salt Lake City Game Music File
- 4A - Unknown Apple II File
- 4A3 - STABCAL ( stability calculation for aqueous systems ) File
- 4A5 - STABCAL ( stability calculation for aqueous systems ) File
- 4B - Unknown Apple II File
- 4B3 - STABCAL ( stability calculation for aqueous systems ) File
- 4B5 - STABCAL ( stability calculation for aqueous systems ) File
- 4BIT - GoDot picture file
- 4BT - GoDot Graphic
- 4BT - GoDot picture format
- 4BW - Unknown Apple II File
- 4C$ - 4Cast /2 Data
- 4C$ - 4Cast /2 datafile
- 4C$ - Datafile - 4Cast /2
- 4C3 - STABCAL ( stability calculation for aqueous systems ) File
- 4C5 - STABCAL ( stability calculation for aqueous systems ) File
- 4CLR - Unknown Apple II File
- 4CM - ClickyMouse macro set Header
- 4CM - ClickyMouse Macro Set ( Pitrinec Software )
- 4CX - 4th Dimension Carbonized Plug -in (4D Inc.)
- 4DA - 4th Dimension User Form User Form File (4D Inc)
- 4DB - 4th Dimension Structure file
- 4DB - 4th Dimension Database Structure File
- 4DB - 4D Database Structure file
- 4DC - 4th Dimension Compiled Structure (4D Inc.)
- 4DD - 4D Chart
- 4DD - 4th Dimension Database Data File
- 4DD - 4th Dimension Data File
- 4DF - 4th Dimension Database Windows Search Document (4D Inc.)
- 4DG - 4th Down Football Scout Game Data File ( MoDi Software )
- 4DK - OS/2 Saved SKF Format File (IBM)
- 4DL - 4th Dimension Database Log File
- 4DL - 4th Dimension Database Windows Log File
- 4DR - 4th Dimension Database Data (4D Inc.)
- 4DR - 4th Dimension Data Resource File
- 4DS - 4th Dimension Database Windows Data Segment (4D Inc.)
- 4DV - 4D View Ultrasound File
- 4DX - 4th Dimension Pugin File
- 4DX - 4th Dimension Database Plug -in (4D Inc.)
- 4FI - 4th Dimension Database Windows ASCII Map (4D Inc.)
- 4FI - 4th Dimension Insider File
- 4FR - 4th Dimension Database Windows Apply Formula Document (4D Inc.)
- 4GE - Compiled code
- 4GE - Informix 4GL Compiled Code
- 4GL - Source code
- 4GL - Informix 4GL language source code file
- 4H3 - STABCAL ( stability calculation for aqueous systems ) File
- 4KHZ - Unknown Apple II File
- 4LB - 4th Dimension Database Windows Label (4D Inc.)
- 4LK - 4th Dimension Database Windows Hot Link File (4D Inc.)
- 4MA - FileMaker Runtime Database ( FileMaker Inc.)
- 4MD - Music file
- 4MP - 4-MP3 Database File
- 4O3 - STABCAL ( stability calculation for aqueous systems ) File
- 4O5 - STABCAL ( stability calculation for aqueous systems ) File
- 4PK - Perfect Keyboard Macro Set ( Pitrinec Software )
- 4PP - Photoparade Slideshow player
- 4PP - PhotoParade Ver 4+ Slideshow ( Callisto Corporation )
- 4QR - 4th Dimension Database Windows Quick Report (4D Inc.)
- 4ST - 4th Dimension Database Windows Saved Set (4D Inc.)
- 4SW - Swap file
- 4SW - 4DOS Swap File - 4DOS
- 4SW - 4DOS Swap File
- 4T - Unknown Apple II File
- 4TH - Forth source code
- 4TH - FORTH Source Code Program
- 4TH - Forth language source file
- 4UG - 4th Dimension Database Windows User / Groups Set (4D Inc.)
- 4V - Quartet Music File
- 4V - Music file
- 4VR - 4th Dimension database windows saved variable
- 4VR - 4th Dimension Database Windows Saved Variable (4D Inc.)
- 4W - Four Winds Mah Jong Saved Layout / Game ( Lagarto )
- 4WD - WebMerge Data List File ( Fourth World Media Corporation )
- 4X4 - 4X4 off road game
- 4XM - 4X Movie video Header
- 4XM - 4X Movie Format
- 4ZX - Genero zoom module settings file
- 5 - IBM Embedded ViaVoice voice type languages scripts data file format
- 5 - Linux file
- 5 - Unformatted manual page ( Roff / nroff / troff / groff )
- 5 - SpotME file
- 5 - FreeBSD file
- 5 - Salt Lake City Game Music File
- 5 - AWP help file
- 5 - Screen Log File
- 500 - NCBridge NC200 / NC400 Series Network Boot Software
- 500 - Nintendo Famicom Disk System file
- 500 - FreeBSD file
- 500 - Unknown Apple II File
- 500 - Tally File ( Tally Solutions Pvt. Ltd.)
- 504 - Unknown Apple II File
- 509 - Internet security certificate
- 512 - Unknown Apple II File
- 52 - Unknown Apple II File
