If a package has directories with names in APP CAPS, distutils.commands.bdist_msi creates properties for them that are also in all caps.

Such properties are handled specially by MSI and are called "public properties (http://www.advancedinstaller.com/user-guide/properties.html).

Due to the way bdist_msi-produced .msi's work, this ultimately results in subtrees of these directories being duplicated to a bogus location (the root directory of the drive on which the .msi being installed is).

E.g. in the attached example, all <python>\Lib\mercurial\locale\<code>\LC_MESSAGES subtrees got duplicated to D:\Lib\<etc>.

See https://bz.mercurial-scm.org/show_bug.cgi?id=5192 for details (including a high-level description of how bdist_msi packages work).

Distutils is now deprecated (see PEP 632) and all tagged issues are being closed. From now until removal, only release blocking issues will be considered for distutils.

If this issue does not relate to distutils, please remove the component and reopen it. If you believe it still requires a fix, most likely the issue should be re-reported at https://github.com/pypa/setuptools