pg_restore not work on windows 2000, when dump file size > 4G

Hello, I run pg_restore on windows. I meet a problem. It is ...

pg_restore not work on windows 2000, when dump file size > 4G and dump file format is custom.

Error information:
dir pg_100.dat
2005-12-13 09:27 4,391,630,151 pg_100.dat

D:\Program Files\PostgreSQL\8.1\bin>pg_restore.exe -d postgres -Upostgres D:\PostgreSQL\backup\pg_100.dat
pg_restore: [archiver] file offset in dump file is too large

thanks.

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