The folowing is a batch file to test your line:
code:
ECHO OFF
ECHO Content of the WINDIR environment variable
ECHO WINDIR = %WINDIR%
IF EXIST "%windir%\kix32.exe" ECHO Found "%windir%\kix32.exe"
IF NOT EXIST "%windir%\kix32.exe" ECHO Cannot find "%windir%\kix32.exe"
IF EXIST "\\yeg01-nts-02\netlogon\yeg05.kix" ECHO Found "\\yeg01-nts-02\netlogon\yeg05.kix"
IF NOT EXIST "\\yeg01-nts-02\netlogon\yeg05.kix" ECHO Cannot find "\\yeg01-nts-02\netlogon\yeg05.kix"
ECHO Calling "%windir%\kix32.exe" "\\yeg01-nts-02\netlogon\yeg05.kix"
PAUSE
%windir%\kix32.exe \\yeg01-nts-02\netlogon\yeg05.kix
ECHO Error %ERRORLEVEL%

Give it a try and report back.
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There are two types of vessels, submarines and targets.