Files installed in PreinstallFolder are deleted at the end of installation

Any files installed in PreinstallFolder (typically, the Target System\Temp\<SessionID> folder) are automatically deleted by the installer when the session ends. You should therefore only place temporary files in this folder, for example subinstallers, and not regular installation files.


To resolve this diagnostic, do one of the following.

Situation Solution
The file in question is intended as a temporary file

Make sure that the file's installation attributes are set as follows:

  • Remove action: Remove always
  • Shared file: clear this box
  • Registration: No self-registration
  • DllInstall: clear this box
  • App paths: clear this box
The file in question is a regular installation file Move (drag & drop) the file to a different installation folder.