Reading Data from SQL Server 2000 Linked Servers

Hello,
I have a colleague who wants to read data from a OO4O driver Linked Server my FRENCH_FRANCE.US7ASCII Oracle 8i database.
He's got some troubles to read data with "é", "à", and so on. They always replaced by "?"
Since I have ask him to use SQL Developer on his server to see if he has got configuration problems, his PL/SQL queries return "square figure" characters (not the usual "²") instead of "?".
For info, I've said it to use CONVERT(column, 'FR8DEC', 'US7ASCII) but it doesn't work too (also try with 'UTF8' or 'WE8MSWIN1252')
Is there a way with the SQL Server collation ???
How can I solve his problem ???

The select query returns the following infos :
PARAMETER VALUE
NLS_CHARACTERSET US7ASCII
NLS_NCHAR_CHARACTERSET US7ASCII
My colleague uses the 10.2.0.1.0 client with ODAC 10.2.0.2.20.
His SQL Server linked server is 2000 with the SQL_Latin1_General_CP437_BIN (he tried the use of the distant NLS_LANG option and the no set the NLS_LANG too with no results).
Thanks in advance,
Yours,
Mickaël

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Text

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