Let's say that your Qview Application contains data sales from Asia, America en Europe. So product description would have different ways to visualize on the screen. Based on the user being analyzing the document you can apply the codepage on that product decription at run time in an expression.
Add a Calculated Dimension based on [PRODUCT DESCRIPTION] and in the Definition.
applycodepage(1201,[PRODUCT DESCRIPTION]) for users from Asia
applycodepage(65001,[PRODUCT DESCRIPTION]) for the rest of users
where 65001 is UTF-8 and 1201 UTF-16BE
note that the above are just examples , you can even have the codepage in a variable
applycodepage([MY FIELD CONTAINING CODEPAGE SELECTED AUTOMATICALLY], [PRODUCT DESCRIPTION])
hope this helps,