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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .A1 | Open Source | Compressed Files | Free Pascal Archive | Free Pascal | Open Source |
| .AW | Microsoft Corporation | Data Files | Answer Wizard File | Free Pascal | Open Source |
| .DPR | Niklaus Wirth | Developer Files | Pascal Source Code | Free Pascal | Open Source |
| .FPC | Microsoft Corporation | Data Files | FoxPro Catalog Memo | Free Pascal | Open Source |
| .O1 | Open Source | Data Files | Object File For GO321v1 Platform | Free Pascal | Open Source |
| .OO | Open Source | Uncommon Files | Free Pascal Object File For OS/2 Version | Free Pascal | Open Source |
| .OW | Open Source | Developer Files | Free Pascal 1.0.x Object File | Free Pascal | Open Source |
| .P | Python Software Foundation | Developer Files | Python Pickle File | Free Pascal | Open Source |
| .PAS | Embarcadero Technologies | Developer Files | Delphi Unit Source File | Free Pascal | Open Source |
| .PP1 | Open Source | Uncommon Files | Free Pascal Compiled Unit | Free Pascal | Open Source |
| .PPL | Open Source | Developer Files | Free Pascal Dynamic Library | Free Pascal | Open Source |
| .PPO | CA Technologies | Uncommon Files | CA Clipper Preprocessor Output | Free Pascal | Open Source |
| .PPU | Open Source | Developer Files | Free Pascal Unit File | Free Pascal | Open Source |
| .S1 | Open Source | Uncommon Files | Free Pascal File | Free Pascal | Open Source |
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