bcp problem - OS related?

[biggoober]

I use the following
bcp bwsql..saleinfo in saleinfo.txt -f saleinfo.fmt -Usa -P


bcp works fine with Sql Server 7.0 on an XP pro box,


but the same statement doesn't work with SQL Server 7.0 on an NT based machine

I get an "attempt to read unknown version of bcp format file" error.
The Version number in the format file is 8.0, and it works fine on XP machine.
If I change version number in format file to 7.0, the error changes to "incorrect host-column number found in BCP format file"

same database copied to both servers, same format files, data files, everything is the same except the operating system.
Any Ideas??