The File Extensions Database


.STL File Extension

  • Category: CAD Files

What is an .STL file?

.STL is Stereolithography 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.

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.

Programs that open Stereolithography File
Windows
IMSI TurboCAD Pro
GOM Inspect
ideaMK STL Viewer
Parametric Technology Creo
Dassault Systemes CATIA
Kubotek USA KeyCreator
MeshLab
Microsoft 3D Builder
Mac
IMSI TurboCAD Deluxe
Cheetah3D
MeshLab
GLC_Player
Linux
Parametric Technology Creo
Dassault Systemes CATIA
MeshLab
GLC_Player
File Type 2:

Certificate Trust List

Developer by: Microsoft Category: Web Files

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.

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

Programs that open Certificate Trust List
Windows
Microsoft Internet Information Services (IIS)
File Type 3:

SuperTux Level File

Developer by: SuperTux Category: Game Files Format: Text

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.

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

Programs that open SuperTux Level File
Windows
SuperTux
Mac
SuperTux
Linux
SuperTux
File Type 4:

Spruce Technologies Subtitle File

Developer by: Spruce Technologies Category: Video Files Format: Text

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.

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 Spruce Technologies Subtitle File
Windows
EZTitles
Avid Media Composer
Mac
Apple Final Cut Pro X
Apple DVD Studio Pro
Avid Media Composer
File Type 5:

Fireworks Style Library

Developer by: Adobe Systems Category: Data Files

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.

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 Fireworks Style Library
Windows
Adobe Fireworks
Mac
Adobe Fireworks

How to solve problems with STL files

  • Associate the STL file extension with the correct application. On :
    Windows: Right click on any STL file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.STL files". Mac: Right click (or Ctrl-click) the STL file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .STL is Stereolithography File. Because only the current version supports the latest STL file format. Search, therefore, e.g. on the N/A manufacturer website after an available .STL is Stereolithography File update.
  • To make sure that your STL file is not corrupted or virus-infected, get the file again and scan it with antivirus software.