> The works for me, but won't for someone who wants to see the .cpt files along with all other.
They'll just have to set up a different opening method for those files in the filetype definitions (right-click on a file of that type and choose Configure Type).
Corel Photopaint files were TIFF-compatible until CPT v6, and you'll probably be able to open those with a "Load Using" value of Internal or Poly Image (or keep the default setting of Equivalent to TIFF). For more recent .cpt files, which are in a proprietary format that nobody but Corel can read, an OLE connection to Corel Photopaint might do the trick.