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jnt
Windows Journal File -
kap
BSB Chart Image File -
kdc
Kaspersky Virus Database File -
key
Keynote Presentation -
kid
Kidspiration Document -
las
LIDAR Data Exchange File -
lbl
NiceLabel Template File -
ldf
SQL Server Transaction Log File -
ldif
LDAP Data Interchange Format File -
lex
Adobe Linguistic Library Data File