File Extensions
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.ppt
Safe
PowerPoint presentation subheader
application/vnd.ms-powerpoint
.pptx
Safe
Microsoft Office Open XML Format
N/A
.ppz
Safe
PPZ
application/vnd.ms-powerpoint
.prc
Safe
Palmpilot resource file
application/x-mobipocket-ebook
.project
Safe
PROJECT
text/plain
.prt
Safe
PRT
application/x-prt
.prx
Safe
PRX
N/A
.ps
Safe
PostScript file
application/postscript
.psafe3
Safe
PSAFE3
N/A