I want to find all excel files referring to a specific excel file "kursplanering_2015.xlsm"
it doesn't work using the search function

Could you be a little more specific please? What do you mean by "referring to"?

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A cell in a file gets its value from a cell in another file using the formula:

=[Kursplanering_2015.xlsm]OrderlägePerMånad!C6

Thereby the first file is referring to the other.
I tried to find all referring files by searching for the string "Kursplanering_2015", totally void of success.
Please correct me if my English is awkward.