Retrieving variable with greek letters using Mathcad API

Hello,

I'm trying to command a Mathcad worksheet from Excel, using the Mathcad API interface.

I would have to access to some variables that use greek letters, but I'm having some problems. Following the help, I'm using the MC.GetValue() function to retrieve the variables from the mathcad worksheet (the MC is the object associated to the mathcad worksheet).

From the help: when variable has greek letters, they should be mapped using the backslash (in Visual Basic), so α is retrived with MC.GetValue("\a"). Whit this form, I can't get any value and I have an error message. The error message is:

Run-time error '-2147218257 (80040caf)

Impossible to find the required value in the worksheet

If the variable hasn't any greek letter, the method MC.GetValue() works perfectly, giving the corresponding values.

I'm using Mathcad 14.0 M020 (14.0.2.5).

Has someone encountered a similar problem? There are some hints to try to solve this problem?

I thank in advance for any help.