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Source code of Windows XP (NT5)
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windows-xp/Source/XPSP1/NT/windows/winstate/doc/special cases.txt

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  1. Special Cases
  3. Name
  4. Key or file
  5. Application
  6. Handled by scanstate/loadstate
  7. Description
  9. Strings containing newlines
  10. Key: unknown
  11. Application: Win98 option pack
  12. Handled: yes
  13. The win98 option pack has some scheme keys that contain newlines. When stored in migration.inf, the strings span a line and migration.inf breaks. Our solution was to store them in migration.inf as special binary fields and convert them back to string fields before saving them to the registry.
  15. Zero length binary keys
  16. Key: unknown
  17. Application: Win98 option pack
  18. Handled: partially
  19. Win98 has some zero length binary keys. NT does not support zero length binary keys. We don't migrate any zero length binary keys.
  21. Reg keys of type none
  22. Key: unknown
  23. Application: Win98 option pack
  24. Handled: partially
  25. Win98 has some registry keys of type REG_NONE. We treat these as REG_BINARY keys.
  27. Key: unknown
  28. Application: printer driver names
  29. Handled: yes
  30. When moving the printer settings, the name of printer driver for the same printer can be different between Win9x and NT. usermig.inf has this mapping.
  32. Key: HKCU\Keyboard Layout\Preload and Substitutes
  33. Application: system keyboard mappings and IMEs
  34. Handled: yes
  35. Win9x uses one key per layout with an unnamed value, while NT uses one value per layout. The functions MigrateKeyboardPreloads and MigrateKeyboardSubstitutes handle this conversion.
  37. Key: HKCU\Control Panel\Desktop\WindowMetrics [*Font]
  38. HKCU\Control Panel\Apperance\Schemes
  39. Application: desktop font settings
  40. Handled: yes
  41. Win9x uses an old 16-bit LOGFONT binary blob, while NT uses LOGFONTW. ConvertLogFont handles this conversion. Do not force he 16-bit LOGFONT blob on NT, or else your desktop will look really wacky. The LOGFONT structure is embedded in the non-client metrics, and so ConvertAppearanceScheme handles this translation.
  43. Key: various keys and values
  44. Application: user settings
  45. Handled: yes
  46. Win9x sometimes uses a DWORD when NT uses a string, and for other settings, Win9x uses a string instead of a DWORD. usermig.inf has a list of keys that need ConvertToDword or ConvertToString.
  48. Key: HKCU\Control Panel\Desktop\FontSmoothing
  49. Application: desktop setting
  50. Handled: yes
  51. The format is different between Win9x and NT. The AntiAlias function translates a "1" into a "2".
  53. Key: HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\RecentDocs
  54. Application: desktop start/documents
  55. Handled: yes
  56. On Win9x an ANSI link shortcut is stored as a binary blob. ConvertRecentDocsMRU converts it to a Unicode link shortcut on NT.
  58. Key: HKCU\Control Panel\Accessibility
  59. Appliction: user accessibility settings
  60. Handled: yes
  61. On Win9x, each setting has its own value. On NT, the settings are represented as bit flags in a DWORD. Scanstate does the translation and outputs the additional flag values in migration.inf.
  63. Key: HKLM\Software\Microsoft\Windows\CurrentVersion\Time Zones
  64. Application: system time zone
  65. Handled: yes
  66. The display names for time zones are different between Win9x and NT. Currently, scanstate is using the standard name instead to identify the time zone. The display name is not migrated (NT version is used).
  67. Key: HKCU\Control Panel\Appearance [Current]
  68. HKCU\Control Panel\Current [Color Schemes]
  69. Application: desktop colors and scheme
  70. Handles: yes
  71. These values are missing for some user-defined schemes. usermig.inf has a section to delete the default values on NT to migrate absent settings.