LotusScript source code file
File type: Source code and script file
An lss file contains source code written in LotusScript, the programming language used by Lotus Notes and Lotus Domino applications.
The file belongs to the Lotus Notes and Domino development environment and can be edited with Lotus Domino Designer.
Found 2 different file type records with the same lss filename suffix.
File type category:
Source code and script file
Date updated: October 6, 2026
The lss file extension is associated with Lotus Notes, originally developed by IBM as a client for Lotus Domino applications and services.
An lss file stores LotusScript source code. It is one of the source-code formats used with Domino Designer when developing or maintaining Notes and Domino applications.
Lotus Domino Designer and the related IBM Notes software are available for Microsoft Windows. LotusScript and the LSS format are legacy technologies, but they remain relevant when maintaining existing Notes and Domino applications.
Open an lss file in Lotus Domino Designer to edit and use the LotusScript source code in a Notes or Domino development project on Microsoft Windows.
Because the file contains source code, a text editor can also display its contents, but it cannot provide Domino Designer's project, design, or development features.
There is no standard conversion from an lss file to another file format. The source code can be opened and edited as text, or incorporated into a Notes or Domino application through Lotus Domino Designer, but this is not a format conversion.
Software applications that can open lss files:
Microsoft Windows
Software applications that can edit lss files:
Microsoft Windows
Software capable of saving lss files:
Microsoft Windows
Software applications that handle other tasks involving lss files:
Microsoft Windows
File type category:
Spreadsheet and workbook file
Date updated: November 16, 2017
The lss file extension is also related to Legato, a spreadsheet editing program from IBM Works suite for OS/2 operating system.
The lss file contains spreadsheet created with Legato program.
Use Legato to work with *.lss files.
Software applications that handle other tasks involving lss files:
Other operating systems or devices
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