| .3D | Interscape | ３Dファイル | 3D Drawing CAD Data | Advanced Print Publisher (formerly Advent 3B2) | Global Publishing Solutions |
| .3F | Global Publishing Solutions | データファイル | Advent 3B2 Template | Advanced Print Publisher (formerly Advent 3B2) | Global Publishing Solutions |
| .3H | Global Publishing Solutions | データファイル | 3B2 Tag Header | Advanced Print Publisher (formerly Advent 3B2) | Global Publishing Solutions |
| .3K | Global Publishing Solutions | データファイル | Advent 3B2 Keyboard Definition File | Advanced Print Publisher (formerly Advent 3B2) | Global Publishing Solutions |
| .3RF | Global Publishing Solutions | 開発者ファイル | Advent 3B2 Extensions Script Cross Reference | Advanced Print Publisher (formerly Advent 3B2) | Global Publishing Solutions |
| .3S | Parametric Technology Corporation | データファイル | Paragraph Styles File | Advanced Print Publisher (formerly Advent 3B2) | Global Publishing Solutions |
| .3T | Global Publishing Solutions | Textファイル | Advent 3B2 Text File | Advanced Print Publisher (formerly Advent 3B2) | Global Publishing Solutions |
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