.Popular Data file extension list:
.mpp - Microsoft Project file
.xml - XML document
.000 - Linux, FreeBSD file
.pst - Microsoft Office Outlook personal folder file
.pinstall - Google Picasa file
.mso - Microsoft Orgchart file
.part - Mozilla Firefox partial download file
.ctt - Windows Live Messenger Contact List
file extension PBK - HP-95 Phone Book
File extension PBK description:
The HP 95LX was the first MS-DOS-based palmtop PC by Hewlett Packard and has been introduced in April 1991. Project name at HP was "Jaguar".The 95LX has MS-DOS 3.3 in ROM, along with powerful PIM applications. Hardware is based on a NEC V20 CPU (CMOS version) running at 5.37 MHz. There are 512kB and 1MB models available, graphics adapter is an MDA, no CGA as the newer HP palmtops have, with 16 x 40 characters and 128 x 240 pixels.
.pbk