I have a Wix installer project in VS2012, which compiled just fine last time I used it (about a week ago). I went back today and get about 15 code page errors:
I had the same problem, but with a "è" char (which is include in CP-1252, so default culture should have worked) . Replacing it by "e" patch the problem but that was not a clean solution.
What really work is adding a .wxl file codepage
also precising 1252 worked
Then you specify the culture to build according to Wix documentation "Specifying Cultures to Build". It need to be the same culture written in the .wxl file.
Building the project in VS2010 now work.
EDIT:
Just adding