如何编辑mif/mid gis数据格式?

I am working on an application (.net 2.0) that uses mif/mid data format to display GIS data. I need to find a way to edit these files with some sort of editor (outside of application). I googled a lot but was unable to find anything suitable (Map Maker worked but did not display labels from mid file). I see following solutions (in order of preference):I am working on an application (.net 2.0) that