[Windows Mobile] airxtreme:
You have to remove the attribute with its associated value (so also everything that is inside the ""). Make sure you don't delete other attributes or you'll lose kitchen tweaks settings.

This is the text to remove:

SYSPackagesViewState="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" OEMPackagesViewState="AAEAAAD/////AQAAAAAAAAAMAgAAAEhPYmplY3RMaXN0VmlldywgVmVyc2lvbj0yLjQuMC4zNjI0LCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPW51bGwMAwAAAFdTeXN0ZW0uV2luZG93cy5Gb3JtcywgVmVyc2lvbj0yLjAuMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPWI3N2E1YzU2MTkzNGUwODkFAQAAADZCcmlnaHRJZGVhc1NvZnR3YXJlLk9iamVjdExpc3RWaWV3K09iamVjdExpc3RWaWV3U3RhdGUJAAAADVZlcnNpb25OdW1iZXIPTnVtYmVyT2ZDb2x1bW5zC0N1cnJlbnRWaWV3ClNvcnRDb2x1bW4PSXNTaG93aW5nR3JvdXBzDUxhc3RTb3J0T3JkZXIPQ29sdW1uSXNWaXNpYmxlFUNvbHVtbkRpc3BsYXlJbmRpY2llcwxDb2x1bW5XaWR0aHMAAAQAAAQDAwMICBlTeXN0ZW0uV2luZG93cy5Gb3Jtcy5WaWV3AwAAAAgBHlN5c3RlbS5XaW5kb3dzLkZvcm1zLlNvcnRPcmRlcgMAAAAcU3lzdGVtLkNvbGxlY3Rpb25zLkFycmF5TGlzdBxTeXN0ZW0uQ29sbGVjdGlvbnMuQXJyYXlMaXN0HFN5c3RlbS5Db2xsZWN0aW9ucy5BcnJheUxpc3QCAAAAAQAAAAQAAAAF/P///xlTeXN0ZW0uV2luZG93cy5Gb3Jtcy5WaWV3AQAAAAd2YWx1ZV9fAAgDAAAAAQAAAP////8ABfv///8eU3lzdGVtLldpbmRvd3MuRm9ybXMuU29ydE9yZGVyAQAAAAd2YWx1ZV9fAAgDAAAAAAAAAAkGAAAACQcAAAAJCAAAAAQGAAAAHFN5c3RlbS5Db2xsZWN0aW9ucy5BcnJheUxpc3QDAAAABl9pdGVtcwVfc2l6ZQhfdmVyc2lvbgUAAAgICQkAAAAEAAAABAAAAAEHAAAABgAAAAkKAAAABAAAAAQAAAABCAAAAAYAAAAJCwAAAAQAAAAEAAAAEAkAAAAEAAAACAEBCAEBCAEACAEBEAoAAAAEAAAACAgAAAAACAgBAAAACAj/////CAgCAAAAEAsAAAAEAAAACAihAAAACAg8AAAACAg8AAAACAh/AgAACw==" EXTPackagesViewState="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"