Bottle names are now validated before creation: names containing characters Windows forbids in paths (\ / : * ? " < > |) silently broke the Wine prefix (wineboot exit 53, could not load kernel32.dll). The New Bottle sheet now explains the problem inline and disables Create. Fixes #12.
If you have a bottle created with such a name, it can never boot — delete it and recreate it with a clean name (spaces and parentheses are fine).