.LOGONXP File Extension
LogonStudio Windows XP Logon Screen
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What is a LOGONXP file?
Custom logon screen format used by LogonStudio, a program for customizing the Windows logon screen; may include a background image, as well as custom lettering and buttons that can be applied to the Windows XP logon screen.
NOTE: LogonStudio logon screens for Windows Vista use the .LOGONVISTA extension.