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Outerra engine	Outlook	Outlook Express Database
Outlook Item File	Outlook for Mac Data File	P
P-Screen COM Screen	P-code	P-touch Editor Label
P3D (PSC)	P4I	P7
PABX background	PAC	PACKER (ImagiSOFT)
PACKWIN	PACK (NoddegamrA)	PACK (TurboPower)
PAE	PAE2	PAF (Personal Ancestral File)
PAK	PAKEXE	PAKLEO
PAK (ARC extension)	PAK (Resident Evil 1997)	PAL
PAL (Dark Reign)	PAM	PAM (Portable Arbitrary Map)
PAM configuration file	PAQ	PAQJ
PAR	PAX (Pick Ax)	PA (PowerArchiver)
PBM	PC-DOS 1.2M format	PC-DOS 1.44M format
PC-DOS 160K format	PC-DOS 180K format	PC-DOS 2.88M format
PC-DOS 320K format	PC-DOS 360K format	PC-DOS 720K format
PC-FILE	PC-Outline	PC-Shrink
PC-Write	PCAP	PCBoard
PCD	PCF	PCIF
PCL	PCM	PCO B16
PCPaint BSAVE	PCPaint CLP	PCPaint PIC
PCR font	PCR image	PCRaster Map
PCX	PCX2COM	PCX2EXE
PCX2EXE (Arminio Grgic)	PCX2EXE (Mike Williams)	PCX Library
PC Screen Font	PDB	PDF
PDF417	PDFXML	PDI
PDL	PDL (Trionum)	PDMark
PDP-1 alphanumeric codes	PDS	PDS4
PE	PEA	PECompact
PEM	PEM encoded RSA private key	PEM encoded certificate
PES	PETSCII	PFF2
PFM	PFM (Portable Float Map)	PFR
PFS	PFS:First Choice	PFS (Portable Floatmap Stream)
PFX	PFX (original format)	PGC
PGC (Portfolio Graphics Compressed)	PGF	PGF (Portfolio Graphics)
PGF (Progressive Graphics File)	PGM	PGML
PGMPAK	PGN	PGNPack
PGP	PGP public key	PGX (JPEG 2000)
PGX (Portfolio)	PHM	PHP
PIC	PIC2	PICS
PICT	PIC (Yanagisawa)	PIC Editor (Andrei Romanov)
PICtor	PIF	PIFF
PIF (Portable Image Format)	PIK	PILOT
PIM	PIPE	PIX
PIXIT	PIX (PIcture in teXt)	PJC (The Master Genealogist)
PKARC	PKARC/PKPAK	PKCS10
PKCS11	PKCS12	PKCS7