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Verify UpdateTempDir isn't maliciously modified
Don't just delete the stored updates temporary directory on launch, but validate the registry key to ensure it is in an expected location and follows WinSparkle's naming convention. This is to prevent malicious users from modifying this registry key and forcing the host app to delete arbitrary directories (a user being able to delete the key would be able to delete the directory themselves, so it's not a serious issue, but it nevertheless is bad behavior and shouldn't be possible).
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