An lzw file extension is related to the Lempel-Ziv-Welch compressed archive format.

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LZW file - LZW compressed archive

What is lzw file? How to open lzw files?

File type specification:

Archive and compressed file type icon Archive and compressed file type

The lzw file extension is used for archives compressed with the LZW compression method.

The compression format LZW is Lempel-Ziv-Welch or LZW compression.

Basically LZW creates tables of strings while compressing/decompressing data, and then later outputs the ID of the string rather than the string itself saving space. Decompression reads this and it to build a table of strings as it reads, saving the compression from needing to write large string tables at the beginning of the file, thus making it very effective.

This lzw file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Help how to open:

Use compatible tools to work with *.lzw files.

How to convert:

As far as we know, this .lzw file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

Related links:

LZW Compression Tutorial

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