Hi,

Some remarks first:
1. the 'grep -x -v -f' command *perfectly* works
(it simply depends on the way you're using it...).
2. your files (EAIDVBR1.txt EAIDQBR1.txt) are DOS-formatted
and contains many blank characters... (this explains why
most of the Unix diff commands seem to fail).

As a consequence, following the steps below should provide the
expected results:

# 1. Convert and cleanup the input files
for FILE in EAIDVBR1.txt EAIDQBR1.txt; \
do \
echo "... converting ${FILE}"; \
dos2ux ${FILE} | sed -e 's@ @@g' > ${FILE}.new; \
done

# 2. Get the required differences (strings in EAIDQBR1.txt
# which do not appear in EAIDVBR1.txt)
grep -x -v -f EAIDVBR1.txt.new EAIDQBR1.txt.new