As of today, I cannot "edit bitmap" from within CDR.
I just dropped a png image into a CDR project, then I decided to do some editing before I use it in my project, so I looked to "edit bitmap" but the option wasn't available.
Not uncommon, if its not a proper bitmap yet...so I "convert to bitmap" ...and still the "edit bitmap" option hasn't become available.
I tired converting a vector object to a bitmap to see if the "edit bitmap" appears, but it stays grayed out.
I've only been working in 2018 for a month or two, but I'm sure I have edited bitmaps and would have noticed this problem sooner.
Has something happened recently that has changed this?
Maybe it's due to any Windows update...
You can associate the CPT files with PhotoPaint. it could be done inside the program, but the best way is to select a CPT file, then choose "open with", but isntead to select any program, choose "use other.." and on the following list select PhotoPaint.
Another way is to go to ControlPanel, programs, and choose "repair" installation.