Comment 3 for bug 552351

confirmed, but it is not exactly clear whose responsibility this is, since the file conversion is actually performed by uniconvertor, not Inkscape. The behaviour of Inkscape with respect to object id's is that, if the incoming object has a unique id then Inkscape will accept it as is. If it has no id then Inkscape will create an id which will always begin with a letter, such as 'g' for goup or 'rect' for rectangle.
    There is a workaround. Convert from .wmf to .svg using uniconvertor offline using the command:
\python26\scripts\uniconv t2.wmf t2.svg
The resulting file is attached. It passes the validation test with one warning. The stroke width is extremely small, so you may have to increase the stroke width to see the object.