I've looked at a bunch of SetACL examples on this site and none seem to be able to convert this batch script into a working AutoIt script.
BATCH
@echo off
"%~dp0setacl.exe" -on "HKEY_CLASSES_ROOT\CLSID\{9C60DE1E-E5FC-40f4-A487-460851A8D915}\DefaultIcon" -ot reg -actn setowner -ownr n:administrators >nul 2>nul
"%~dp0setacl.exe" -on "HKEY_CLASSES_ROOT\CLSID\{9C60DE1E-E5FC-40f4-A487-460851A8D915}\DefaultIcon" -ot reg -actn ace -ace "n:administrators;p:full" >nul 2>nul
Reg.exe add "HKCR\CLSID\{9C60DE1E-E5FC-40f4-A487-460851A8D915}\DefaultIcon" /ve /t REG_EXPAND_SZ /d "C:\My.ico" /f
NON-WORKING AUTOIT
RunWait('setacl.exe "HKCR64\CLSID\{9C60DE1E-E5FC-40f4-A487-460851A8D915}\DefaultIcon" -ot reg -actn setowner -ownr "n:administrators"')
RunWait('setacl.exe "HKCR64\CLSID\{9C60DE1E-E5FC-40f4-A487-460851A8D915}\DefaultIcon" -ot reg -actn setowner -ownr "n:administrators;p:full"')
RegWrite('HKCR64\CLSID\{9C60DE1E-E5FC-40f4-A487-460851A8D915}\DefaultIcon', '','REG_EXPAND_SZ','C:\Windows\My.ico')
Any ideas on what I'm doing wrong?