Run an .exe file with 1 input parameter from MATLAB

Question

I have an .exe file developed in C# that is called by Matlab.

DirPath = '\\MYSERVER\PARENT_DIR\CHILD DIR\'

The old version of my command worked right

without input parameter: system( fullfile([DirPath 'NameOfExe']) )

The new version which requires an input parameter is failing. Can you please help me fix it?
I have tried many versions but the error is always:
'\MYSERVER\PARENT_DIR\CHILD' is not recognized as an internal or external command, operable program or batch file.

With input parameter, FAIL:

strcommand = [  '''' fullfile([DirPath 'NameOfExe' ]) ' ' inputparameter '''' ];
eval(['[a,b]=system(' strcommand ')'])`

Correct usage when using CMD: (say I: is my mapped drive to MYSERVER, & inputparameter is a path)

myroot:> cd I:
I:>cd PARENT_DIR\CHILD
I:\PARENT_DIR\CHILD>NameOfExe "inputparameter"