Open MSP Wizard
InstallShield 2020
Before InstallShield can open a patch or MSP file for editing or create a new patch project, it needs the base MSI to which the MSP should be applied. When you first open a patch (.msp) project in InstallShield, the Open MSP Wizard appears.
The Open MSP Wizard gathers the necessary file information, applies the patch to the base MSI, and opens the patch project in the IDE in Direct MSP mode (which is similar to the Direct Edit mode). The data you specify in the Open MSP Wizard is saved so the next time you open the MSP file, the patch project opens in the IDE.
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