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$FileToOpen=myfile.xlsx;

$ perl -e '$FileToOpen=myfile.xlsx;'
$

$ perl -we '$FileToOpen=myfile.xlsx;'
Unquoted string "myfile" may clash with future reserved word at -e lin
+e 1.
Unquoted string "xlsx" may clash with future reserved word at -e line 
+1.
Name "main::FileToOpen" used only once: possible typo at -e line 1.

$ perl -Mstrict -e '$FileToOpen=myfile.xlsx;'
Global symbol "$FileToOpen" requires explicit package name (did you fo
+rget to declare "my $FileToOpen"?) at -e line 1.
Bareword "myfile" not allowed while "strict subs" in use at -e line 1.
Bareword "xlsx" not allowed while "strict subs" in use at -e line 1.
Execution of -e aborted due to compilation errors.

$ perl -MO=Deparse -e '$FileToOpen=myfile.xlsx;'
$FileToOpen = 'myfilexlsx';
-e syntax OK

use strict;
use warnings;