When opening a .mud file you might get a warning error that states the following, File version is too new or is corrupt. This could be due to the following reasons:
To increase the manipulator size in Maya press + and to decrease the manipulator size press -, these are the keyboard shortcuts to adjust the manipulator size.
Autodesk Maya is an industry-standard for 3D Animation, Visual Effects and Games development industry. In the early days Maya was known for having advanced features, which in recent times in common among competing 3D animation software.