File extension Details of LTR, LXFML, LYT, RT, LUF, KNT, IIL, IPF, IDX

Name:	LTR
File Type:	Letter File
Popularity:	3
Category:	text
File Description:	Text document containing a message or other correspondence
Open Programs:	Mac OS Any text editor Windows Any text editor

Name:	LXFML
File Type:	LEGO Digital Designer XML File
Popularity:	3
Category:	text
File Description:	XML document that describes the LEGO bricks used in a 3D scene created with LEGO Digital Designer; saved within the compressed .LXF model file; read by LEGO Digital Designer and can be viewed in a text editor.
Open Programs:	Mac OS LEGO Digital Designer BricksViewer View in a text editor Windows LEGO Digital Designer BricksViewer View in a text editor

Name:	LYT
File Type:	TurboTax Install Log File
Popularity:	3
Category:	text
File Description:	Log of all files installed during a TurboTax software installation; includes filenames and file locations
Open Programs:	Mac OS Any text editor Windows Any text editor

Name:	RT
File Type:	RealText Streaming Text File
Popularity:	3
Category:	text
File Description:	Text presentation streamed from the Internet, often via the Web using the RealPlayer plug-in; may be a text-only stream, or may be combined with an audio or video media stream.
Open Programs:	Mac OS RealNetworks RealPlayer or Web browser with Real Player plug-in installed Windows RealNetworks RealPlayer or Web browser with Real Player plug-in installed

Name:	LUF
File Type:	Lipikar Uniform Format File
Popularity:	3
Category:	text
File Description:	Rich text (.RTF) file saved by Lipikar, a multi-language desktop authoring tool for Windows fonts; created when the contents of the Lipikar text box are saved to a file. Text saved in an LUF file conforms to the limitations of the text box; all text is formatted with a single font, color, style, and effect.
Open Programs:	Mac OS Any text editor Windows Lipikar Any text editor

Name:	KNT
File Type:	KeyNote Note File
Popularity:	3
Category:	text
File Description:	Text file created with KeyNote, a multi-featured notebook program based on Windows standard RichEdit control; allows multiple notes to be saved in a single file; supports advanced text formatting as well as styles, macros, plugins, and templates.
Open Programs:	Windows KeyNote

Name:	IIL
File Type:	CleanSweep Installation Log
Popularity:	1
Category:	text
File Description:	Log file containing information about programs and files scanned or removed by Norton CleanSweep
Open Programs:	Windows Used by Norton CleanSweep View with a text editor

Name:	IPF
File Type:	OS/2 Help File
Popularity:	3
Category:	text
File Description:	Contains help documentation for IBM OS/2 or AIX systems; similar to a .HLP file in Windows; IPF files are referenced by the Information Presentation Facility system on OS/2 systems; help documentation may include hyperlinks that allow the user to jump from one topic to another. The IPF format originated from the Generalized Markup Language developed by IBM; may be compiled into a viewable HLP file using the IPF Compiler (IPFC).
Open Programs:	Mac OS Any text editor Windows Any text editor Linux Any text editor

Name:	IDX
File Type:	Outlook Express Mailbox Index File
Popularity:	3
Category:	text
File Description:	Stores an index of mail messages stored in an Outlook Express mailbox (.MBX file); should be located in the same folder as the mailbox files; required for importing old Outlook Express mailboxes into Outlook Express 5 or later.
Open Programs:	Windows Microsoft Outlook Express

Name:	IMAPMBOX
File Type:	IMAP Mailbox
Popularity:	3
Category:	text
File Description:	Folder that stores e-mail messages (.emlx) and attachments (.emlxpart) locally from an IMAP mail server
Open Programs:	Mac OS Mac OS X Mail