cannot execute binary file

trying to execute a binary file located on a NFS mount and get:

bash: ./_binary_: cannot execute binary file

thought I might miss the "exec" mount option, but no, the answer is here: forums.fedoraforum.org

"This message appears if you e.g. try to execute a 64 bit program on a 32 bit system. Please check with the "file" command whether the program fits your architecture."