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msilib.make_id() currently ensure that any of the following characters are not in the resulting ID: " -+~;"
Per the Microsoft documentation the following list of characters are allowed.
http://msdn.microsoft.com/en-us/library/aa369212(v=vs.85).aspx
"""The Identifier data type is a text string. Identifiers may contain the
ASCII characters A-Z (a-z), digits, underscores (_), or periods (.). However, every identifier must begin with either a letter or an underscore."""
If an file name contains any characters outside of the characters " -+~;" + string.ascii_letters + string.digits + "._" then it will be an invalid ID.
This includes many punctuation characters which are valid in file names but not ID's, and every unicode character which does not overlap with ASCII.
The attached patch tries to fix this - and it includes tests.

New changeset ec84bd4c5ac4 by Martin v. Löwis in branch '2.7':
Closes #11696: Fix ID generation in msilib.
http://hg.python.org/cpython/rev/ec84bd4c5ac4
New changeset df66ce66834b by Martin v. Löwis in branch '2.7':
Add missing file from #11696.
http://hg.python.org/cpython/rev/df66ce66834b
New changeset f3d96d28a86e by Martin v. Löwis in branch '3.1':
Closes #11696: Fix ID generation in msilib.
http://hg.python.org/cpython/rev/f3d96d28a86e
New changeset 4dff2e436191 by Martin v. Löwis in branch '3.2':
merge #11696
http://hg.python.org/cpython/rev/4dff2e436191
New changeset c12e1ea49532 by Martin v. Löwis in branch 'default':
merge #11696
http://hg.python.org/cpython/rev/c12e1ea49532 

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http://www.python.org/psf/contrib/contrib-form/