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platform/process/src/../../data/test.dat
[download]

and

platform/data/test.dat
[download]

are not necessarily equivalent. For example,

$ readlink -f /tmp/platform/process/src/../../data/test.dat
/tmp/platform/process/data/test.dat
[download]

Notice that

platform/process/src/../../data/test.dat
[download]

is equivalent to

platform/process/data/test.dat
[download]

from that directory.

Tools like File::Spec that don't access the disk can't fold away ".." safely. You need Cwd's realpath

$ perl -MCwd=realpath -le'print realpath $ARGV[0]' \
    /tmp/platform/process/src/../../data/test.dat
/tmp/platform/process/data/test.dat
[download]

You can then make it relative again if that's what you desire.

(Yeah, me bad in the CB)