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Allusers Install vs. Per User Install
From WiX Wiki at MindCapers
ALLUSERS Property
Define the value of the ALLUSERS property as follows
<Property Id="ALLUSERS" Value="1" />
Possible values are
- null = a per-user install
- "1" = a per-machine install
- "2" = an ambigous alternative dependent on OS-versions and other things
When the value of this property is undefined, the installer behaviour is also undefined, being best described as per-user with erratic differences between profiles. It is therefore important to define the property value.
This property also governs the meaning of the HKMU registry key symbol.
Values are also affected by the Package/@InstallScope attribute which can have the following values:
- perUser
- perMachine (This sets the ALLUSERS property to 1)
Ref:Joy of Setup - Bob Arnson’s blog about setup and servicing

