How can I convert DocX including CorelDraw items to PDF?

I'm trying to convert DocX files to PDF files but some of DocX files contain specific drawings. This drawings were import from CorelDraw to Doc file 10-15 years ago then convert into DocX. The problem is that when i'm trying to "Save As PDF", all the features of the drawing are magnified...

For your information, this conversion was make on C# but, with Microsoft Word, that's fail too.

I had try to install CorelDraw but I think, link is delete.

I hope someone know how to make this conversion with "unknow objects" without modified them.

Thanks a lot!