To use the Greek character set, add the following values to the registry key
HKEY_CLASSES_ROOT\MIME\Database\Charset\iso-8859-7:
Codepage : REG_DWORD 0x04E5 (1253)
BodyCharset : REG_SZ : iso-8859-7
To use the Turkish character set, add the following values to the registry key
HKEY_CLASSES_ROOT\MIME\Database\Charset\iso-8859-9:
Codepage : REG_DWORD 0x04e6 (1254)
BodyCharset : REG_SZ : iso-8859-9