If I try to display extended characters such as the Greek alpha (α) or beta (β) in a table header row, they initially display correctly but are replaced by '?' when the window is saved. If I try to set them from code by creating a new dataset, the characters are replaced by something else e.g. 'α' (code U+03B1) is replaced by '±' (code U+00B1).

Is there any way of displaying extended characters in table headers correctly? They display in labels without a problem.

You could use html coding. I just tried displaying phi, and it worked ok:

Step7,

That works excellently well

For reference, the numbers should be in decimal (rather than the hexadecimal of Unicode), so α is &#945 and β is &#946.