A user wants to read a set from this sheet, in an xlsx file (also attached) created by Excel:

The amplxl driver is used like this:
set FAMILY;
table FAMILY "amplxl" "FAMILY.xlsx": [FAMILY] IN;
read table FAMILY;
display FAMILY;
But under Windows, the set displays like this in a command window,

and like this in the IDE:

The problem is that Excel uses UTF-8 encoding, while the command window and the IDE are displaying the set member names using different extended ASCII encodings. AMPL stores the correct UTF-8 bytes, so that results written out to a spreadsheet do show the correct accented characters.
It's not clear what to recommend to the user, other than to avoid accented (and other non-ASCII) characters in the spreadsheet, but I'm opening this issue in case anyone has an idea.