Registry key edit to enable plain text passwords for Win98 PC's:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VxD\VNETSUP]
"EnablePlainTextPassord"=dword:00000001

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Registry key edit to enable plain text passwords for WinXP Pro PC's:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanworkstation\parameters]
"enableplaintextpassword"=dword:00000001