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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
PKCS7 certificate	PKI (ImgFun)	PKLITE
PKLITE32	PKM	PKP
PKPAK	PKPass	PKTINY
PKWARE DCL Implode	PK font	PL/I
PL4	PLA	PLANET
PLASMA	PLD (PhotoLine)	PLN
PLOT-10	PLY	PM
PMA	PMC MicroMate floppy disk	PMD
PMD (Pixel)	PMG Designer	PM (XV image)
PMexe	PMsfx	PNG
PNG Plus	PNM	POHMELFS
POL	POSTNET	POV-Ray density file
POV-Ray scene description	PPM	PPMD
PPMZ	PPMZ2	PPM (Flipnote)
PPMd	PPT	PPTX
PQA	PRAMFS	PRC
PRC (PalmOS)	PRC (Palm OS)	PRF (Fastgraph)
PRF (Polychrome Recursive Format)	PRJ	PRONOM
PRQL	PRT	PRT (CADKEY)
PRT (PTC)	PRT (UG)	PRT scene description
PS	PS1 saved game	PSB
PSD	PSF	PSF1
PSF2	PSF (PhotoStudio)	PSI-MI XML
PSI-PAR	PSM	PSMF
PSMODEL	PSRFITS	PT1
PT2	PT3	PTC (Resident Evil 1997)
PTF	PTG	PTM
PTS	PTX	PTX (Pro Tools)
PUID	PUT	PUT and GET (Scott Jennings)
PUZ	PUZ (crossword puzzles)	PVK
PVR Texture	PWC (Piecewise-Constant Image Model)	PWDraw
PWG Raster	PWI	PXL-2000
PXM (Pixelmator)	PXT	PYT
PZX	P (Microsoft programming language)	PabloPaint
Pack	Pack-Ice	PackARC
PackBits