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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .33B | Unknown Developer | Developer Files | SYNETSIM Source Code | SYNETSIM | Unknown Developer |
| .3RF | Global Publishing Solutions | Developer Files | Advent 3B2 Extensions Script Cross Reference | Advanced Print Publisher (formerly Advent 3B2) | Global Publishing Solutions |
| .4DB | 4D, Inc | Developer Files | 4th Dimension Database Structure File | Unknown Software | Unknown Developer |
| .4DC | 4D, Inc | Developer Files | 4th Dimension Database Structure File | Unknown Software | Unknown Developer |
| .4FI | 4D, Inc | Developer Files | 4th Dimension Insider File | 4D SQL | 4D, Inc |
| .4GE | IBM | Developer Files | IBM Informix 4GL Compiled Source Code | IBM Informix | IBM |
| .4GL | IBM | Developer Files | Informix 4GL Language Source Code | IBM Informix | IBM |
| .4PK | Pitrinec | Developer Files | Perfect Keyboard Macro Set | Perfect Keyboard | Pitrinec |
| .4TH | Open Source | Developer Files | Forth Language File | Kate | KDE |
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