Mozilla Firefox/Thunderbird user profile folder
File type: Settings, options, themes or skins file
An slt file extension is related to the Firefox web browser and Thunderbird, an e-mail client and used for their user settings files.
Found 8 different file type records with the same slt filename suffix.
File type category:
Settings, options, themes or skins file
Date updated: June 27, 2025
The slt file extension is related to various products by Mozilla Foundation, such as the Firefox web browser and Thunderbird e-mail client.
The slt file contains saved user profile settings.
The slt files are used for internal purposes of Mozilla apps.
Conversion to other formats is not possible.
Software apps that manage or store settings in slt files:
Microsoft Windows
Apple macOS / Mac OS X
Linux/Unix
File type category:
Various data file
Date updated: October 23, 2018
Record marked as obsolete and not updated for a long time.
The slt file extension is associated with the FinSafe Terminal Smartlet application used to emulate terminal.
The slt file stores various data used for internal purposes of the FinSafe Terminal.
The FinSafe Terminal seems to be obsolete product.
File type category:
Mobile phones related file
Date updated: May 2, 2018
The slt file extension is nowadays mainly related to Gallery Lock, an app for Android that allows users to hide photos and other pictures on their smartphones.
The slt file represents a thumbnail of the original "hidden picture which is located in a hidden folder on the SD card in the following location:
/mnt/sdcard/.gallery_lock/
The actual image seems to be hidden in an altered slm file.
These files are only generated for previewing purposes, probably not meant to be opened directly.
No evidence of any working conversion could be found for SLT file type.
Programs for viewing slt files:
Google Android
Software apps that create slt files:
Google Android
File type category:
Settings, options, themes or skins file
Date updated: December 17, 2018
The slt file extension is associated with the K-Meleon, a web browser based on Gecko Layout Engine (Firefox, Seamonkey) available for Microsoft Windows operating system.
The slt file stores settings for K-Meleon.
Probably not meant to be accessed by the user.
Probably cannot be converted to anything else.
Software apps that manage or store settings in slt files:
Microsoft Windows
File type category:
Document file
Date updated: January 18, 2019
The slt file extension is related to Senlab, an address label printing software for Microsoft Windows operating system developed by Sente Limited.
The slt file is a template for newly created labels.
Use Senlab to work with the *.slt files.
Probably can be exported to other formats.
File type category:
3d graphics, CAD-CAM-CAE file
Date updated: August 24, 2018
The slt file extension is associated with the Shark LT, a 2D/3D design tools for Microsoft Windows and Apple Mac OS X operating systems.
The slt file stores 2D, or 3D drawing created in Shark LT.
Use Shark LT to open *.slt drawing files.
Probably can be exported to other formats.
Software applications that can open slt files:
Multiplatform
Software applications that can edit slt files:
Multiplatform
Software capable of saving slt files:
Multiplatform
Programs for viewing slt files:
Multiplatform
Software apps that create slt files:
Multiplatform
Software apps that convert slt files:
Multiplatform
Software apps that print slt files:
Multiplatform
File type category:
Source code and script file
Date updated: October 2, 2026
Telix was a telecommunications program originally written for DOS by Colin Sampaleanu and released in 1986. Later versions were distributed by deltaComm Development, including a version for Windows. Telix could dial bulletin board systems and other phone-line services, and supported ANSI emulation and several file transfer protocols.
SALT was a powerful, C-like scripting language built into Telix. An .slt file is the editable source for a SALT script; it is compiled using the SALT tools before the script is run by Telix. Telix was also known for its fast built-in implementation of the Zmodem file transfer protocol, rather than requiring a separate program.
The DOS version was a popular shareware program during the late 1980s and early 1990s. The Windows version was delayed and rewritten by a new author in Turbo Pascal for Windows rather than in the original implementation's C, and its attempted copy protection was unpopular. The growth of the World Wide Web also reduced demand for bulletin board software.
An .slt file is source text, so it can be viewed and edited with a plain-text editor. Use an editor that does not add formatting or change the file's text encoding if the source will later be compiled for Telix.
To use the script, open or compile it with the SALT compiler or development tools supplied with a compatible DOS version of Telix. Modern systems may require a DOS environment or emulator to run the original tools.
There is no standard conversion from SALT source to another scripting language. The practical way to use an .slt file is to compile it with the compatible Telix SALT tools; this produces a compiled Telix script rather than a converted source file.
If only the text is needed, the source can be saved as plain text, but that does not make it usable by another scripting system without rewriting the SALT code.
File type category:
Emulator file
Date updated: October 2, 2026
The Super Level Loader format was developed by Damien Burke for ZX Spectrum emulators. It replaces the traditional level-loader arrangement, which required many separate files for each game, with a single snapshot file containing all of the level data files.
The format was designed in cooperation with James McKay (x128), Gerton Lunter (Z80), Rui Ribeiro (WSpecEm), and Darren Salt, who contributed to Z80Em. It is supported by several ZX Spectrum emulators, including XZX-Pro for Linux and Unix, and is quite widely supported.
On Linux or Unix, open the SLT file with XZX-Pro and load it as a ZX Spectrum snapshot. Other ZX Spectrum emulators can open it only if they specifically support the Super Level Loader format.
SLT files are emulator snapshots rather than documents intended for general-purpose conversion. A compatible ZX Spectrum emulator may be able to load the file and save the running state in another snapshot format, but this may not preserve the Super Level Loader's bundled level data.
Software applications that can open slt files:
Linux/Unix
XZX-Pro
Software apps that create slt files:
Linux/Unix
XZX-Pro
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