Although both .xdoc and .dcs files are used by QuarkXpress, they cannot be directly converted between each other.
This is because a .dsc file is some sort of color setting and not document, like the .xdoc file. At best, you can export the color settings from QuarkXpress, but a xdoc to dsc conversion is not likely.
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.