Access 2021 : "like" clause with SQL don't work with accent

Hi Georges, thank you for your help.

The test below explains my problem.

I have a table named "Couleurs" (colors in English) used to describe the color of wines ("Vins" in French). The "Vins" table contains the wines with their color.
My goal is to display in a combo-box the wines corresponding to the color I selected in my list-box. But, if the item in my list-box is "----", I want to display all the wines.

Now the problem: If the column "Vin couleur" from my table "Vins" is indexed, the query returns no data containing an accent (like "Rosé"). But if I remove the indexation of that column, the SQL works perfectly. Is it possible that the indexation doesn't work if accented data is used?

Thank you and best regards, Jean-Claude (Geneva/Switzerland)

Query used in my list-box nammed "zlst" to select which color ("Couleurs") of wine ("Vins") I want to display.
SELECT Couleurs.Field1 FROM Couleurs ORDER BY Couleurs.Field1;

Query used in my combo-box to display wines ("Vins") corresponding to the color selected in "zlst"
If the selected item is "----", all items are displayed.

SELECT Vins.Id, Vins.Vin, Vins.Coul FROM Vins
WHERE (((Vins.Coul) Like (IIf([forms]![Form1]![zlst]="----","*",[forms]![Form1]![zlst]))))
ORDER BY Vins.Id, Vins.Vin;

Table "Vins" (wines) containing description of wines.

Id            Vin           Vin couleur

1             ----           ----

2             Eta           Rouge

3             Gamma   Rosé

4             Delta       Rosé

5             Thêta      Rouge

6             Epsilon   Rosé-Clair

7             Beta        Clair-Rosé

8             Alpha      Blanc

9             Omega   Rosé-Foncé