SD4LF file format description

Many people share .sd4lf files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .sd4lf file can be edited, converted or printed with. On this page, we try to provide assistance for handling .sd4lf files.

1 filename extension(s) found in our database.

.sd4lf - Smart Diary Suite 4 Life Factor Package

The SD4LF data files are related to Smart Diary Suite 4. The SD4LF file is a Smart Diary Suite 4 Life Factor Package. Smart Diary Suite 4 is a completely customizable personal information manager for Microsoft Windows.

Smart Diary Suite 4
Data files
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Smart Diary Suite 4 Life Factor Package related extensions:
Digital Path Lines Memorizer Line Coordinates Data
MODTRAN ACD Spectral Output File
Advent 3B2 Paragraph Styles
4D Database Search Document
OS/2 Warp Application Information
Nebula Device 2 ASCII Mesh Resource Data

Naturally, other applications may also use the .sd4lf file extension. Even harmful programs can create .sd4lf files. Be especially cautious with .sd4lf files coming from an unknown source!

Can't open a .sd4lf file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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