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 TIL - Tilia file
File extension TIL description:
Probably old file extension or not supported application..til
Associated applications to file extension TIL:
TIL