In general this is not a general programming forum. This is a codeblocks forum, so this is the wrong place for this question.
Disclaimer, this is more pseudo code than actual code:
In your case i think _T defines to something like this
or something like this
what translates to
#define _TCHAR(n) wchar_t(n)
so your final line of code is
wxString Dir ={'X', ':' + '\\'} + {'F','o','l','d','e','r','n','a','m','e'};
what is like
wxString Dir = char[4] + char[11];
and adding arrays is not defined...
what is a binary operation, normally