| M17NObjectHead | The first member of a managed object |
| MCodingInfoISO2022 | Structure for a coding system of type MCODING_TYPE_ISO_2022 |
| MCodingInfoUTF | Structure for extra information about a coding system of type MCODING_TYPE_UTF |
| MConverter | Structure to be used in code conversion |
| MDrawControl | Type of a text drawing control |
| MDrawGlyph | Type of information about a glyph metric and font |
| MDrawGlyphInfo | Type of information about a glyph |
| MDrawMetric | Type of metric for glyphs and texts |
| MDrawTextItem | Type of textitems |
| MFaceBoxProp | Type of box spec of face |
| MFaceHLineProp | Type of horizontal line spec of face |
| MInputContext | Structure of input context |
| MInputDriver | Structure of input method driver |
| MInputGUIArgIC | Type of the argument to the function minput_create_ic() |
| MInputMethod | Structure of input method |
| MInputXIMArgIC | Structure pointed to by the argument arg of the function minput_create_ic() |
| MInputXIMArgIM | Structure pointed to by the argument arg of the function minput_open_im() |