More exploration, based on the stackoverflow I posted in the IRC

root@etz-mercury:~# tclsh8.6
% glob para*
{para luís 24.txt}
% encoding system iso8859-1
% glob para*
{para luís 24.txt}
% file size [glob para*]
could not read "{para luís 24.txt}": no such file or directory
% exec wc -l [glob para*]
wc: '{para luís 24.txt}': No such file or directory
% exec wc -l \"{*}[glob para*]\"
wc: '"{*}{para luís 24.txt}"': No such file or directory
% exec [list wc -l [glob para*]]
couldn't execute "wc -l {{para luís 24.txt}}": no such file or directory
% set globpara [glob para*]
{para luís 24.txt}
% lindex $globpara 1
% lindex $globpara 0
para luís 24.txt
% exec [list wc -l [lindex $globpara 0]]
couldn't execute "wc -l {para luís 24.txt}": no such file or directory
% exec wc -l [lindex $globpara 0]
0 para luís 24.txt
% encoding system utf-8
% exec wc -l [lindex $globpara 0]
wc: 'para luís 24.txt': No such file or directory
% set globpara [glob para*]
{para luís 24.txt}
% exec wc -l [lindex $globpara 0]
0 para luís 24.txt
%