If you wrap the part that requires the quotes to be passed on to runas between single quotes then all should be fine.
Kix does not care if you feed it single or double quotes as long as you match them in pairs.

Eaxmple code:
 Code:
runnas.exe /user:joe '"KIX32.EXE kixScript.kix $passedFile=C:\something or the other.txt"'
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- Chuck Norris once sold ebay to ebay on ebay.