.LSX file extension

To open .LSX files on Windows, double-click the .LSX file to try opening it in Microsoft Windows Media Player.

To open an .LSX file, use a Windows Media–compatible player (most commonly Microsoft Windows Media Player). If you expected a real video file, note that .LSX usually contains a link/playlist that redirects to streaming media rather than the media itself.

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Last updated: June 11, 2026 · Reviewed by Julian Stricker

What “reviewed” means on this page

Format fit: whether the “what is this file?” description matches common real-world use of the extension, including category, typical MIME types, and aliases.
Opening paths: whether Windows / macOS / Linux steps read plausibly for current OS dialogs and default apps; we remove fantasy menus and unsafe shortcuts.
Security framing: whether risk notes match the extension class (for example executables vs plain data) and whether affiliate wording does not contradict the security section.
Sources and further reading: whether external links point to vendors, standards bodies, or other primary references where possible; we avoid inventing details we cannot ground.
Limits: this is clarity and safety-messaging QA, not a guarantee that every statement is exhaustive or that every binary you download is harmless.

Full methodology in the Imprint — The Imprint also states where AI is used and what that does—and does not—replace.

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .LSX files

Use these platform-specific instructions to open .LSX files safely.

Windows

Double-click the .LSX file to try opening it in Microsoft Windows Media Player.
If it opens in the wrong app, right-click → Open with → choose Windows Media Player (or another Windows Media–compatible player).
If playback fails, confirm you have network access and the referenced stream is still available.

Full Windows guide

Mac

.LSX is primarily associated with Windows Media streaming shortcuts; macOS may not have a common default app for it.
If you only need to see what it points to, open the .LSX in a plain text editor to look for a referenced media URL, then open that URL in a compatible media player on a desktop system.

Full Mac guide

Linux

.LSX is a Windows Media streaming shortcut/redirector and may not be supported out of the box on Linux.
Open the .LSX in a text editor to locate any referenced stream/URL, then try opening that stream in a media player that supports Windows Media/ASF streams on your system.

Full Linux guide

iOS

iOS typically won’t open .LSX as a media file; if you received one, view it as text (if possible) to find the stream link, or transfer it to a Windows PC to open with Windows Media Player.

Full iOS guide

Android

Android commonly lacks direct support for .LSX redirector files; if needed, inspect the file content (to find a stream link) or open it on a Windows PC with Windows Media Player.

Full Android guide

Security notes

.LSX files are typically redirectors: treat them like you would a link. They may direct your player to a remote stream or server you did not expect.
If an .LSX arrives unexpectedly, inspect it in a text editor first to see what location it references before opening it in a media player.
Be cautious in managed environments: opening an .LSX can trigger network access to external/internal hosts (which may be undesirable or blocked by policy).

Complex decoders and untrusted media

Image, audio, and video decoders are large software surfaces; issues are uncommon for everyday files but show up with crafted files from unknown sources. Keeping the OS and media apps updated matters most; scanning is reasonable extra caution for downloads you cannot vouch for.

Avast

Avast offers free and premium antivirus software that protects against viruses, malware, ransomware, and phishing. Scan files before opening them to ensure safety.

Norton

Norton 360 delivers comprehensive antivirus protection, VPN, and identity theft monitoring. Scan files for threats before opening to keep your device secure.

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Can't open this file?

These are the most common causes and fixes when .LSX files fail to open.

Common reasons

The .LSX file opens but nothing plays
Windows asks what app to use (no associated program)
You expected a real video file, but .LSX is very small
The file opens on Windows but not on Mac, Linux, iOS, or Android

Fix steps

Check that you are online and (if relevant) connected to the correct VPN/corporate network.
Try opening the .LSX on Windows Media Player (commonly supported for this file type).
If you can view the file content as text, look for the referenced URL/stream and verify it still works.

OS-specific troubleshooting

What is a .LSX file?

.LSX is generally used as a streaming audio/video shortcut or redirector, similar in purpose to .ASX. It is commonly mapped to the MIME type video/x-la-asf and is handled by Windows Media components. In practice, the file often references a remote media location, so playback depends on network access and the referenced stream still being available.

Background

In most real-world use, an .LSX file is not a standalone “video file” containing video data. Instead, it acts like a small launcher/playlist that tells compatible media software where to find a Windows Media/ASF stream (often over a network).

Multiple references map .LSX to the MIME type video/x-la-asf (alongside related extensions like .LSF), indicating its role in Windows Media/ASF streaming workflows rather than being a distinct container format itself.

Because .LSX files can point to a remote stream, they are often used in managed environments and documentation sets that standardize MIME types for media delivery. If the stream URL is outdated, blocked, or requires credentials, the .LSX file may “open” but fail to play anything.

Common MIME types: video/x-la-asf

Common .LSX issues

The .LSX file opens but nothing plays

Many .LSX files are redirectors to a network stream. If the referenced stream is offline, moved, blocked, or requires access you don’t have, the player may show an error or do nothing.

Check that you are online and (if relevant) connected to the correct VPN/corporate network.
Try opening the .LSX on Windows Media Player (commonly supported for this file type).
If you can view the file content as text, look for the referenced URL/stream and verify it still works.

Windows asks what app to use (no associated program)

If the file association for .LSX is missing, Windows won’t know which program should handle the streaming shortcut.

Right-click the file → Open with → choose Microsoft Windows Media Player.
Optionally set Windows Media Player as the default app for .LSX if you open these files regularly.

You expected a real video file, but .LSX is very small

.LSX commonly acts like a pointer/shortcut rather than containing the video itself, so file sizes can be only a few KB.

Ask the sender whether they meant to provide the actual media file (e.g., an ASF/WMV file) instead of a streaming shortcut.
Open the .LSX in a text editor to see what stream or media location it references.

The file opens on Windows but not on Mac, Linux, iOS, or Android

.LSX is primarily tied to Windows Media/ASF streaming associations and may not have common native support on other platforms.

Use a Windows PC with Windows Media Player for the most straightforward opening experience.
As a workaround, inspect the .LSX as text to extract the referenced stream and try opening that stream in a compatible player on your platform.

FAQ

Is an .LSX file the actual video?

Usually no. Commonly, .LSX is a streaming audio/video shortcut/redirector that points to media (often Windows Media/ASF-related) rather than containing the media data itself.

What program opens .LSX files on Windows?

Microsoft Windows Media Player is commonly listed as able to open .LSX streaming shortcut files.

What MIME type is associated with .LSX?

Sources map .LSX to the MIME type video/x-la-asf.

Can I convert an .LSX file into a normal video by renaming it?

No. Renaming doesn’t convert it. If the .LSX references a stream, you would need to access the referenced media source; the .LSX itself typically isn’t a video container.

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