.STL File Extension

.STL File Extension

File Type 1

Stereolithography File

Developer N/A
Popularity
3.7  |  51 Votes
Category CAD Files
Format Binary

What is an STL file?

Design format used for stereolithography, a rapid prototyping technology used for producing three-dimensional parts; contains a 3D design used as a master model for creating numerous prototypes.

More Information

Stereolithography is an interchange file format. It is used to save CAD files in a standard format that can be read by multiple CAD applications.

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Programs that open STL files

Updated August 20, 2019
File Type 2

Certificate Trust List

Developer Microsoft
Popularity
3.0  |  10 Votes
Category Web Files
Format N/A

What is an STL file?

List of predefined items that have been signed by a trusted entity; may consist of a list of filenames or a list of certificates; each item in the list has been approved by the signing entity.

More Information

Certificate trust lists (CTLs) are used by Microsoft IIS to store trusted websites and other addresses that require a secure connection.

Programs that open STL files

Updated June 7, 2007
File Type 3

SuperTux Level File

Developer SuperTux
Popularity
2.6  |  8 Votes
Category Game Files
Format Text

What is an STL file?

Game file used by SuperTux, a 2D jump and run side scrolling game similar to Super Mario Bros.; saved in a plain text format and specifies the features of a level, such as enemy unit locations, positions of blocks, and the time limit; also includes a reference to the music and background image for the level.

More Information

STL files are stored in the /data/levels/ directory of the installation.

Programs that open STL files

Windows
Mac
Linux
Updated October 21, 2011
File Type 4

Fireworks Style Library

Developer Adobe Systems
Popularity
2.4  |  8 Votes
Category Data Files
Format N/A

What is an STL file?

Library of styles referenced by Macromedia (now Adobe) Fireworks; may be used to apply Stroke, Fill, Effect, and Text attributes to an object within an open Fireworks project; can be helpful for creating a uniform look across multiple objects.

More Information

Some styles are included with Fireworks, though additional styles may be added to the program. To add extra styles, click the small icon in the top right corner of the Styles panel in Fireworks and select "Import Styles." Then browse to an STL file and click OK to add the style library to your current collection.

Programs that open STL files

Windows
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Mac
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Updated May 2, 2014
File Type 5

Spruce Technologies Subtitle File

Developer Spruce Technologies
Popularity
2.3  |  8 Votes
Category Video Files
Format Text

What is an STL file?

Movie subtitles file used by video playback and authoring applications; stores the time each subtitle should be displayed; also specifies instructions for how to display subtitles; used for broadcasts, annotating video files, or for storing movie translations.

More Information

STL files contain commands, comments, and entries. Commands begin with the dollar sign ($) character and can specify fonts, colors, alignment, and other subtitle properties. Comments are delimited by "//" characters. Entries contain the actual subtitle timestamp and text. Here is an example entry:

00:00:11:13 , 00:00:11:42 , This is an example subtitle.

NOTE: STL subtitles are sometimes referred to as EBU subtitles, since the standard comes from the European Broadcasting Union (EBU).

Programs that open STL files

Updated February 18, 2014

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