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UserBase tells me that KDE configuration files are encoded in UTF-8. https://userbase.kde.org/KDE_System_Administration/Configuration_Files In practice some *rc files have bytes outside that encoding. In my home directory I found two files that are not valid UTF-8. I searched with find ~/.config/ -name '*rc' -exec file {} + which gives these exceptions: akonadiconsolerc: Non-ISO extended-ASCII text, with very long lines kmail2rc: Non-ISO extended-ASCII text, with very long lines In kmail2rc, the offending fields are [AttachmentView]/State [CollectionFolderView]/HeaderState Both are QByteArray values saved from QHeaderView::saveState(). In the instance I found, the offending bytes were 0x81 and 0x84. akonadiconsolerc had way more of these values. All seem related to saving widget state and hence probably QByteArrays. The written QByteArray values look very strange. The bytes in the non-printable ASCII range are written as \xXX but the values above 127 are written literally. The encoding is done by KConfigIniBackend::stringToPrintable. It does not currently escape bytes that are larger than 127.

UserBase tells me that KDE configuration files are encoded in UTF-8. https://userbase.kde.org/KDE_System_Administration/Configuration_Files In practice some *rc files have bytes outside that encoding. In my home directory I found two files that are not valid UTF-8. I searched with find ~/.config/ -name '*rc' -exec file {} + which gives these exceptions: akonadiconsolerc: Non-ISO extended-ASCII text, with very long lines kmail2rc: Non-ISO extended-ASCII text, with very long lines In kmail2rc, the offending fields are [AttachmentView]/State [CollectionFolderView]/HeaderState Both are QByteArray values saved from QHeaderView::saveState(). In the instance I found, the offending bytes were 0x81 and 0x84. akonadiconsolerc had way more of these values. All seem related to saving widget state and hence probably QByteArrays. The written QByteArray values look very strange. The bytes in the non-printable ASCII range are written as \xXX but the values above 127 are written literally. The encoding is done by KConfigIniBackend::stringToPrintable. It does not currently escape bytes that are larger than 127.

UserBase tells me that KDE configuration files are encoded in UTF-8. https://userbase.kde.org/KDE_System_Administration/Configuration_Files In practice some *rc files have bytes outside that encoding. In my home directory I found two files that are not valid UTF-8. I searched with find ~/.config/ -name '*rc' -exec file {} + which gives these exceptions: akonadiconsolerc: Non-ISO extended-ASCII text, with very long lines kmail2rc: Non-ISO extended-ASCII text, with very long lines In kmail2rc, the offending fields are [AttachmentView]/State [CollectionFolderView]/HeaderState Both are QByteArray values saved from QHeaderView::saveState(). In the instance I found, the offending bytes were 0x81 and 0x84. akonadiconsolerc had way more of these values. All seem related to saving widget state and hence probably QByteArrays. The written QByteArray values look very strange. The bytes in the non-printable ASCII range are written as \xXX but the values above 127 are written literally. The encoding is done by KConfigIniBackend::stringToPrintable. It does not currently escape bytes that are larger than 127.