Most popular Data file extensions:
.ctt - Windows Live Messenger Contact List
.dat - Generally text or binary datafile
.3dr - 3DMark result
.pst - Microsoft Office Outlook Personal folder file
.xml - XML document
.mpp - Microsoft Project file
.metadata_never_index - iPod file (Mac specific file)
.sys - Data file
file extension VX - EARS component file
File extension VX description:
EARS = UK Liberal Democrats Election Agents Record System, probably specialized software..vx
Associated applications to file extension VX:
VX