O

Object file (Unix)

O

Object file (Atari)

O

Object file (GCC)

OAS

Word processor document (Fujitsu OAS)(Japanese)

OAZ

Fax (NetFax Manager)

OB

Object cut/paste file (IBM LinkWay)

OBD

Binder template (Microsoft Office)

OBD

Binder (Microsoft Office)

OBJ

Object file

OBR

Object browser data file (Borland C++)

OBS

Script (ObjectScript)

OBV

Visual interface (ObjectScript)

OBZ

Binder Wizard (Microsoft Office)

OCF

Object craft file (Object Craft)

OCR

Transcribed fax-to-text file (FAXGrabber)

OLE

Object Linking and Embedding (OLE) custom control (Microsoft)

ODL

Type library source (Visual C++)

ODS

Mailbox file (Microsoft Outlook Express)

OFD

Form definition (ObjectView)

OFF

Object File (3D Mesh)

OFN

FileNew file (Microsoft Office)

OFT

Template (Microsoft Outlook)

OKR

Feldeinteilung module file (3-D Fassade Plus)

OKT

Music module (MOD) (Oktalyzer)

OLB

Object Library (OLE) (Microsoft)

OLB

Object library (VAX)

OLD

Backup file (Generic)

OLE

OLE object

OLI

Text file (Olivetti)

OO1

Voice file (Typhoon)

OOGL

Object Oriented Graphics Library

OOM

Swap file (Shroom)

OPJ

Project file (Orcad Schematic Capture)

OPL

Organiser Programming Language source file (Psion/Symbian)

OPN

Active options (Exact)

OPO

Output executable file (OPL)

OPT

Developer Studio file (Microsoft)

OPT

Optimize support file (QEMM)

OPW

Organization chart (Org Plus for Windows)

OPX

Extension DLL (OPL)

OPX

Inactive options (Exact)

ORA

Parameter file (Oracle)

ORC

Script (Oracle 7)

ORG

Calendar file (Lotus Organizer)

OR2

Calendar file (Lotus Organizer 2)

OR3

Lotus Organizer 97 file

ORA

Configuration file (Oracle 7)

OSS

Search file (Microsoft Office)

OST

Offline file (Microsoft Exchange/Outlook)

OTL

Outline font description (Z-Soft Type Foundry)

OTL

Template file (Super NoteTab) (Fookes)

OTL

Template file (PrintMaster Gold)

OTX

Text file (Olivetti Olitext Plus)

OUT

Output file (Microsoft C)

OV

Database file (Revelation-DOS)

OV1

Overlay file

OV2

Overlay file

OVD

Datafile (ObjectVision)

OVL

Overlay file

OVR

Overlay file

O$$

Outfile (Sprint)


P

Source code (Pascal)

P

Application parameter file (ReaGeniX code generator)

P

Picture file (APPLAUSE)

PA1

Worktable (PageAhead)

PAB

Personal Address Book (Microsoft)

PAC

Package file (Sound Blaster Studio II)

PAC

Image (Stad)

PAD

Keypad definition (Telemate)

PAK

Compressed archive (PAK)

PAK

WAD file (Quake)

PAL

A compressed file (Generic)

PAL

Color palette (Microsoft)

PAN

Printer specific file (CorelDRAW)

PAQ

Password encrypted zip file (Hewlett-Packard)

PAR

Parts application (Digitalk PARTS)

PAR

Parameter file (Fractint)

PAR

Permanent output file (Microsoft Windows 3.x)

PAS

Source code file (Borland Pascal)

PAT

Hatch pattern file (DataCAD)

PAT

Pattern file (CorelDRAW)

PAT

Patch file (Advanced Gravis Ultrasound/Forte Technologies)

PAT

exePatch utility used for Warcraft2 (WarHack)

PB

Fax (FAXability Plus)

PB

Phone book (WinFax Pro)

PB

Setup file (PixBase)

PB1

Document (First Publisher for Windows)

PBA

Source code file (Powerbasic BASIC) (Genus)

PBD

Phone book (FaxNOW!-Faxit)

PBD

Dynamic library, an alternative to a native DLL (PowerBuilder)

PBF

Turtle Beach Pinnacle Bank File

PBI

Include file (PowerBasic) (Genus)

PBI

Profiler binary input file (Microsoft Source Profiler)

PBK

Microsoft Phonebook

PBL

Library file used in a development environment (PowerBuilder)

PBL

PowerBasic library (Genus)

PBM

Portable bitmap graphic

PBM

Planar bitmap graphic (XLib)

PBO

Profiler binary output (Microsoft Source Profiler)

PBR

Resource file (PowerBuilder)

PBT

Profiler binary table (Microsoft Source Profiler)

PC

Text file (IBM)

PC3

Custom palette (Harvard Graphics 3.0)

PC8

Ascii text IBM8 character set (NewWave Write)

PCB

Application data file (Microsoft Powerpoint)

PCC

Cutout picture vector graphics (PC Paintbrush)

PCD

Image (Kodak Photo-CD)

PCD

P-Code compiled test scripts as in Microsoft Test and Microsoft Visual Test

PCE

Maps Eudora mailbox names to DOS filenames

PCF

Profiler command file (Microsoft Source Profiler)

PCH

Patch file (Generic)

PCH

Precompiled header file (Microsoft C/C++)

PCI

PCI Miniport file (Microsoft Windows System file)

PCJ

Multimedia authoring tool graphics (IBM Linkaway-Live)

PCK

Pickfile (Turbo Pascal)

PCL

Printer Control Language file (printer-ready bitmap) (Hewlett-Packard)

PCM

Audio file

PCM

PCM file (OKI MSM6376 Sythesizer Chip)

PCP

Live Update Pro file (Symantec)

PCS

Animation (PICS)

PCS

Picture storage file (Microsoft)

PCT

PICT drawing (Macintosh)

PCW

Text file (PC Write)

PCX

PC Paintbrush bitmap (ZSoft)

PDA

Bitmap graphics

PDB

Data file (TACT)

PDB

Physical model backup file (PowerDesigner)

PDB

Database file (3Com PalmPilot)

PDD

Graphic image that can be opened with Paint Shop Pro and Adobe PhotoDeluxe

PDF

Portable Document file (Adobe Acrobat) (displayable with a Web browser)

PDF

Definition File

PDF

Printer Definition File (Netware)

PDF

Graphics file (ED-SCAN 24bit)

PDL

Project description language file (Borland C/C++)

PDM

Physical model file (PowerDesigner)

PDP

Print Shop Deluxe file (Broderbund)

PDQ

Flowcharting PDQ Lite file (Patton&Patton)

PDS

Photographic image file (origin not yet identified)

PDS

Hardware assembly source code file (Pldasm)

PDT

Database file (ProCite)

PDV

Printer driver (Paintbrush)

PDW

Document (Professional Draw)

PDX

Database index file (ProCite)

PE3

Image archive file (Ulead PhotoImpact)

PE3

Image archive file (QuickViewer)

PE4

Image archive file (Ulead PhotoImpact v.4.0)

PEB

Program Editor bottom overflow file (Microsoft WordPerfect for Windows Library)

PED

Program Editor delete save file (Microsoft WordPerfect for Windows)

PEM

Program Editor macro (Microsoft WordPerfect for Windows library)

PEQ

Program Editor print queue file (Microsoft WordPerfect for Windows)

PER

Program Editor resident area file (Microsoft WordPerfect for Windows Library)

PES

Program Editor work space file (Microsoft WordPerfect for Windows Library)

PET

Program Editor top overflow file (Microsoft WordPerfect for Windows Library)

PF

Encrypted file (Alladin Systems)

PFA

Type 3 font (ASCII)

PFB

Type 1 font (binary)

PFC

PF Component file

PFC

Text file (First Choice)

PFC

Personal filing cabinet file (AOL)

PFF

Paraform file for 3D modeling (Scandata)

PFK

Programmable function keys (XTreePro)

PFM

Printer Font Metrics (Microsoft)

PFS

Database text file (PFS:Write)

PFT

Printer font (ChiWriter)