mde to accde conversion is typically searched by inexperienced MS Access users that are looking for a way to convert .mde files to .accde files, which is unfortunately not possible.
Both of these files are used for compiled databases, meaning you cannot further edit or export them, just open them with the stand-alone executable.
In case you want to turn older .mde file to newer .accde variant, the only way how to do it, is to export/compile the source file again. Renaming the extensions obviously is not the solution either, although it is for some reason presented as one of the viable solution.
This conversion entry was verified by us and conversion was flagged as wrong or not possible.
Usually this happens when the conversion would try to convert different types of data between each other, such as audio to image, or it is not possible because incompatibility between programs, caused by closed file formats, very limited support etc.
If you find entry that you feel is flagged as bad wrongly, please tell us in the discussion below with as much as information as possible so we can fix it.