Seems I can't "unforget" erroneously forgotten files, so will have to forget them and then re-add them
#!/bin/bash
# script to generate exports for this component
# copy ../win32/* to /tools/sbs/win32/bv
find ../win32 -type f -print | grep -v 'distribution.policy.s60' | sed 's!\.\./win32\(.*\)!\.\./win32\1 /tools/sbs/win32/bv\1!' > exports.inf