MSI does not install all files when RemovePreviousVersion is run?

Based on the default custom action sequence, Windows Installer determines which files need to be installed/overwritten before removing any existing versions of software. Windows Installer uses the value of the REINSTALLMODE property to tell it how to make decisions about when to overwrite files. If REINSTALLMODE contains an "o", then it will only install files where the version is different or the file doesn't already exist; non-versioned files will only be installed if the Modified Date of the file is The file is not modified).

If the REINSTALLMODE contains an "a", it will always install the file, regardless of any version or date information attached to existing files.

OK, well talking to someone else where I am helped me find a solution to the problem.

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