WinMust - Simple UPS status monitor

WinMust Main Window


WinMust is a free Windows application designed to monitor and control a compatible Mustek brand UPS (Uninterruptible Power Supply). It provides the user with status information, such as battery voltage, AC line failure or backup operating mode.

Should the UPS run out of battery, the software can be configured to shut down the host computer to prevent damage to the system or loss of data.

Supported Systems


Connected via

Since I have no access to any other UPS for testing than the PowerMust 800, I am not able to give a detailed list of supported models.



Screenshot Status Window Screenshot Status Window (Backup Operation) Screenshot Preferences Window Screenshot About Window


All Downloads are available through WinMust's release page on Sourceforge.


WinMust Setup - Download

Version: beta, Date: 2008-08-09, Format: .EXE, Size: 199 kiB
MD5: 5a99db17a173345ea33273038327fd5d

Source - Download

Version beta, Date: 2008-08-09, Format: .7z, Size: 123 kiB
MD5: e412feda8d541b5c42dc6604c376c152

.NET Framework

The installer will notify you, if Microsoft .NET Framework 2.0 or higher is not installed. In this case, it can be downloaded here:

Microsoft .NET Framework

Other UPS software

A few other free UPS tools are available for Windows. Some of them also support the Mustek PowerMust 800 UPS, that WinMust was written for.


The USB interface of this software is based on HID.Net (libhidnet) by George Helyar. is a free cross-platform software project with the aim of making HID software development as easy as possible. It is listed on Sourceforge and distributed under GPLv3 license. I would hereby like to thank George very much for this valuable contribution!

Other helpful ressources on this topic were:



Although WinMust has been designed to communicate with Mustek PowerMust UPS, this software is not a Mustek product. Mustek has not reviewed or tested WinMust and does not endorse its use. Please do not contact Mustek for support on this software.


GPLv3 Free Software! This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

Contact and Support

For contact details, bug reports and further information please see Winmust's Sourceforge project page and use the Trackers and Forums listed on this page. Logo

Microsoft, Windows, Windows XP, Windows Vista and .NET are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. Mustek and PowerMust are either registered trademarks of Mustek, Inc. in the United States and/or other countries. Other product and company names mentioned on this page may be the trademarks of their respective owners.

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