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Editorial Team
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Asked: 2026-06-17T20:02:45+00:00

I want to install my application into E drive (E:\MyApp) if not exists then

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I want to install my application into E drive (E:\MyApp) if not exists then D drive (D:\MyApp), if D drive also doesn’t exist in the target computer then I want to install in C drive (C:\MyApp). Which variable should I use in preproccessor to check drive existence ? Can anyone help me? 

<?if E Drive exists ?> 
<?define varRootDrive = "E:\" ?> 
<?elseif  D Drive exists ?> 
<?define varRootDrive = "D:\" ?> 
<?else ?> 
<?define varRootDrive = "C:\" ?> 
<?endif ?> 
<?endif ?> 

<Property Id="TARGETDIR"> $(var.varRootDrive) </Property>
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1 Answer

  1. Editorial Team

    The preprocessor statements evaluate at build time not install time. You will need a custom action to detect if valid drive letters exist and to set the installlocation dynamically at install time.

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