If startup.kix resides in "c:\windows\system32\" you don't have to worry me thinx 
manual quote :
Locating Files
During the logon sequence, KiXtart automatically tries to locate all files that it is asked to open (SPK, WAV, TXT, and so on) by searching for them first on the NETLOGON drive, then on the drive where KiXtart was started from, and finally in the current directory. This behavior can be overridden by prepending the filename with a drive letter or a UNC path.
This is not exactly a logon sequence, it's more a startup sequence...
I can't tell if locating files works likewise in startup scripts.
hth
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