There are 5 other file types using
the MLS file extension!
.mls - Miles Sound Tools compressed DLS data
.mls - mAirList script file
.mls - Skype localization data
.mls - WorshipCenter Pro document
.mls - CrystalPlayer playlist
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What is mls file? How to open mls files?
File extension used by Simplicity scheduling software.
The default software associated to open mls file:
Simplicity 
Company or developer:
KIDASA Software, Inc.
Milestones Simplicity can be used to create presentation-ready schedules, track, and plan your projects. To make a schedule, just type in the project steps, then click and drag to add milestone dates and Gantt bars.
Help how to open:
Due the variability and uncertainty of this file type group, there is no general information available, about how to open this various data file format. However most files with extension from this group are usually not meant to be opened or viewed directly. If there are associated applications or programs listed below the extension description, you can always try to check their website for additional informations on their forums or other type of customer support.
For general information try to look at:
Identifying unknown file formats
How to convert:
Due the variability and uncertainty of this file type group, there is no general information available, about how to convert this various data file format. However most files with extension from this group are usually not in formats, which can be converted. If there are associated applications or programs listed below the extension description, you can always try to check their website for additional informations on their forums or other type of customer support.
List of recommended software applications associated to the .mls file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open mls file, edit mls file, convert mls file, view mls file, play mls file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with mls file - Milestones Simplicity file
Click on the software link for more information about Simplicity. Simplicity uses mls file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).
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