The MIX format used in old and now discontinued Microsoft PhotoDraw is rarely supported nowadays, yet you can still find some programs like Xnview/Xnconvert that support it and should be able to convert it to some more modern format PNG.
Convert Microsoft PhotoDraw image to Portable Network Graphic.
We found 2 software records in the database related to .mix to .png file format conversion.
Microsoft Windows software - convert mix to png on Windows
A dedicated conversion software
Convert from mix file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned mix to png. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Multiplatform software - convert mix to png on any platform
A popular utility for viewing and converting graphic files