What is the LST file format?
.lst files are list files that store data as organized entries or line-by-line listings. To open most .lst files, a text editor such as Notepad or WordPad is all you need - you will be able to read them right away. They are normally written in plain-text format, which is why it is easy to view them in any text editor, and they can be used by different programs as well.
But sometimes you might not be able to open a .lst file if it is written in a binary format specific to one application - in that case you will have to use the same software that created it in the first place. A quick test: if the file looks readable in Notepad, it is plain text; if it shows garbled characters, it is a program-specific binary.
The .lst extension has no single standardized meaning. Common uses include:
- Simple lists of file paths, names, or values (one item per line)
- Compiler or assembler output listings, similar in spirit to a log file
- Package or software inventory lists, as used by some DOS and Linux packaging tools
- Playlist-style indexes, serving a similar role to an M3U playlist
Because .lst is a generic convention rather than a registered format, there is no file signature (magic bytes) to identify it. The associated MIME type for plain-text .lst files is text/plain.
Security & safety
RISK: LOWA text .lst is safe to open and read - it's just lines of text and cannot execute. The only cautions: if a .lst is an INPUT list that a program acts on (e.g. a build manifest, a batch list, or a script's file list), editing it changes what that program does, so back up the original before changing entries. And a .lst that looks like random characters is a binary/proprietary list - don't try to 'fix' it in a text editor; use the program that created it. As with any downloaded text file, only the program reading it could act on its contents.
Format details
in a nutshellFULL NAMEList File (generic plain-text list / listing)
DEVELOPERN/A - generic extension reused by many programssince No single origin - a long-standing convention across DOS/Unix tools and many applications
CATEGORYText Files
MIME TYPEtext/plain
TYPEUsually plain text (a list of items, one per line, or a compiler/program listing); occasionally a program-specific binary
Programs that open LST files
Windows3 apps
Windows Notepad
Built-in Right-click > Open with > Notepad for a quick look. Fine for small text lists. 
Notepad
Open-source Right-click > Edit with Notepad++ to read/edit the list with line numbers. Best free choice for any text .lst. 
Visual Studio Code
Free Open large or structured .lst files with search, line numbers, and column editing. 
macOS2 apps
Linux2 apps
GNOME Text Editor / gedit
Open-source Open the .lst to read or edit it; the default editor handles list files fine.
nano / vim
Open-source Edit in the terminal: 'nano file.lst'. Handy for server-side list/manifest files. Technical details
deep spec| Primary encoding | Plain text (ASCII or UTF-8) in the majority of cases; a minority of programs write proprietary binary `.lst` data |
| MIME type | `text/plain` (no registered subtype specific to `.lst`) |
| File signature (magic bytes) | None - `.lst` has no standard magic bytes; the format must be identified by context or the originating application |
| Typical line structure | One entry per line: a file path, item name, numeric value, or assembler/compiler listing row |
| Line endings | Platform-dependent: CRLF on Windows-created files, LF on Unix/Linux |
| Character encoding (legacy files) | Often the system code page (e.g., Windows-1252 or IBM 437) in files produced by DOS-era tools |
| Format ownership | No single developer; a long-standing informal convention reused independently by many programs and operating systems |
| Binary variant behavior | Program-specific binary `.lst` files contain no readable text structure and must be opened with the exact originating application |
| Common producing tools | Assemblers, C compilers, package managers, DOS batch utilities, and playlist generators |
| Hierarchy / nesting | Flat by convention (one item per line); some variants use leading spaces or tabs to indicate sub-items or indented listing rows |
| Compression | Not compressed; content is stored as raw text or raw binary bytes with no built-in compression layer |
| Typical file size | Ranges from a few bytes (short name lists) to several megabytes (verbose compiler listings or large package indexes) |
| Assembler/compiler listing format | In compiler/assembler use, each line typically pairs a source-code line number and instruction with its generated hex output |
| Identification approach | Open in a plain-text editor: readable output confirms plain-text `.lst`; garbled characters indicate a binary or encoded variant |
| Released | No single origin - a long-standing convention across DOS/Unix tools and many applications |
LST conversions
Possible
Community Q&A
asked by users
A
A
Frequently asked questions
How do I open a .lst file?
Most .lst files are plain text - open them with Notepad++, VS Code, or Notepad on Windows, TextEdit on Mac, or gedit/nano on Linux. If the contents look like gibberish, it's a binary list and only the program that created it can read it.
What is a .lst file?
A generic 'list' file: a list of items (file names, paths, values) or a program-generated listing, usually one entry per line in plain text. There's no single .lst standard - its meaning depends on the program that made it.
Why does my .lst file look like random characters?
Because that program saved its .lst in a proprietary binary format rather than text. A text editor can't display it meaningfully - open or regenerate it from within the originating application.
Can I open a .lst file in Excel?
Yes, if it's delimited data (commas or tabs): rename it to .csv or use Excel's text-import wizard and pick the delimiter. A plain one-item-per-line list will simply become a single column.
What program creates .lst files?
No single one - compilers/assemblers (listing files), installers and build tools (manifests), games, and many apps all reuse .lst. Identify the owner by the folder it's in or by opening it as text to read its contents.
Is a .lst file the same as a .txt file?
Usually, yes in practice - most .lst files are plain text and open in the same editors. The .lst extension just signals 'this is a list', and some programs treat it specially; a minority store binary data under .lst.
References
1Notepad++ - free source code/text editornotepad-plus-plus.org
2Visual Studio Code - code/text editorcode.visualstudio.com
