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I would also like to have an answer for that.
With standard module description (.mod files) you can set an MAYA_MODULE_PATH env var, to have a single shared directory on the network, containing all your modules, without having to install them on each and every computer that contains maya.
With the xml description (PackageContents.xml), it seems your module (for example MayaBonusTools) has to be located in the local disk (C:\ProgramData\Autodesk\ApplicationPlugins\)
How to workaround this limitation ?
Thanks.