Metafiles in word

I have a problem deleting enhanched metafiles in word.

I use automation with word, i create emf files (using a c++ application) and later i import
that file into word using "addpicture".
As long as word i still open i can't delete the emf file,
i get a sharing violation (even when link to file is set to false). The file can be deleted after Word is closed.

Does any one have an idea??

Thanks!!