MLS File

What are MLS files and how to open them

Are you having problems opening a MLS file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your MLS files.

What is a MLS file?

MLS files have multiple uses, and Milestones Simplicity Project is one of them. Read more about the other uses further down the page.

Milestones Simplicity Project

The .mls file extension is most commonly associated with the Milestones Simplicity schedule software. This application is used for creating schedules in a presentable format. These schedules are frequently used to plan projects and manage deadlines.

The schedules created with the software are saved with the .mls file extension. The MLS files can include text, icons, and other images used to create the schedule presentation.

How to open MLS files

We have identified two MLS openers that are compatible with this specific type of MLS file.

Programs that open Milestones Simplicity Project files

Last updated: August 9, 2026

All known file formats using extension .MLS

While Milestones Simplicity Project is a popular type of MLS-file, we know of 3 different uses of the .MLS file extension. Different software may use files with the same extension for different types of data.

Netware 4.x Server License

We know that one MLS format is Netware 4.x Server License. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

While we have not verified the apps ourselves yet, our users have suggested ten different MLS openers which you will find listed below.

Skype Localization Data

Skype Localization Data files (.MLS) store language and regional user-interface translations used by the Skype application to display menus, messages, labels and other text in different languages. They are produced by Skype to provide localized strings so that users can interact with Skype in their preferred language.

These files are created by Skype itself during installation or updates, or when new language packs are added. Skype reads .MLS files when it starts up or when the user changes the display language, and uses them to substitute UI text. They are not meant for end-users to edit or convert, and they are typically bundled with Skype rather than distributed separately by third-party tools.

MLS files begin with the ASCII signature MLSW at the very start of the file (bytes 4D 4C 53 57 at offset 0). At offset 7 there is another identifying string ".skypePM" (bytes 00 73 6B 79 70 65 50 4D 20).

MLS opener for Windows

We have identified one MLS opener that is compatible with this specific type of MLS file.

Various apps that use files with this extension

These apps are known to open certain types of MLS files. Remember, different programs may use MLS files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about MLS file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.