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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: August 9, 2013
The SLT file extension was also used by Telix for one of its file formats. Telix was a telecommunications program originally written for DOS by Colin Sampaleanu and released in 1986. More recent versions were distributed by deltaComm Development, including a version for Windows.
The DOS version was considered by some to be one of the most popular shareware programs of the late 1980s and early 1990s. Its strengths included having a fast built-in version of the Zmodem file transfer protocol, rather than needing a separate program, and a powerful scripting programming language similar to C, 'SALT' (Script Application Language for Telix).
The Windows version suffered from a variety of problems, including delays in publication (it was a complete rewrite by a new author in Turbo Pascal for Windows rather than the original's C), an unpopular attempt at copy protection; and the World Wide Web's impact on bulletin board systems also reduced demand.
Telix can be used to dial bulletin board systems or other phone-line based services. It supports ANSI emulation and various file transfer protocols.
File type category:
Emulator file
Date updated: August 9, 2013
The SLT file extension is used by ZX Spectrum emulator. The level loader trap has one annoying disadvantage; lots of extra files lying around for each game. The super level loader was developed by Damien Burke to replace this multi-file format with a single snapshot file containing all the level data files. It has been designed in co-operation with James McKay (x128), Gerton Lunter (Z80), Rui Ribeiro (WSpecEm) and Darren Salt (helping with Z80Em), and is quite widely supported.
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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