If you are creating a patch using installshield, you can either create an update.exe or a MSP file. Advantage of creating MSP is that; you can open it in ORCA and see the difference the patch brings out.
But be careful !!!
Never run the MSP by double clicking on it. It will trouble you for sure, you might see some features getting added automatically. You might see a new feature getting installed through patch. You will find a ADDLOCAL = newfeature getting joined to the installation in the MSI install log.
To avoid always use following command for applying the patch.
msiexec.exe /p "
My advice will be is to create Update.exe always if you ever need a MSP you can extract it. So, if you need a MSP out of update.exe; run the exe and search for the msp in temp folder when you are at the PatchWelcome screen.
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