Opening a .CDR file ?

Inkscape would not open my CDR file. I get a message UniConverter Failed, followed by several lines of file locations & line numbers which seem to be where errors occurred.

I installed the trial version of CorelDRAW X6.
It opens the file but states there is an invalid fill ID, whatever that is. I click on Ignore & the file opens. I then save it with a new CDR filename, but I get the same error message when I try to open this new CDR file with Inkscape. It appears the error is being carried over to the new CDR file.

Then I saved it as an SVG file & I get an SVG Export screen which gives me General information and also states there are 2 Issues.

The upper box states:
Invalid IDs found
Non-RGB colors

The lower box states:
Details: One or more IDs used are either duplicates or contain invalid syntax.
Suggestions: Check all group, object & symbol instance names to ensure they are not duplicated within the file & do not start with a number. Duplicate & invalid IDs will automatically be appended on export.

It appears I should save & use the SVG file. This means I will not need CorelDRAW. But what should I do about the duplicate and/or invalid IDs?

Using Inkscape I exported the image as a PNG bitmap. It looked OK in Windows Photo Viewer & Windows Paint. But Photoshop Elements displayed a gray & white background checkerboard pattern. Irfanview displayed basically a negative, & the main logo looked dark gray.

I saw a Transparency checkbox in CorelDRAW when exporting to PNG & it controlled the checkerboard background. I then found a similar setting in Inkscape > Document Properties. That solved the checkerboard issue & also let Irfanview display a proper image.

But with Transparency enabled why would PE show the background but not Photo Viewer or Paint? And why would Irfanfiew display a black background?