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["연번","파일명","분류","유형","확장자","용량(kb)","파일경로"]

{"sheet":"Sheet3","index":1,"n_rows":10,"n_cols":2,"rows_kept":10,"cut":false,"hidden":false,"merged":[]}
["확장자","유형"]
["hwp","한글파일"]
["hwpx","한글파일"]
["xlsx","엑셀파일"]
["xls","엑셀파일"]
["pdf","PDF파일"]
["jpeg","이미지"]
["png","이미지"]
["exe","실행파일"]
["json","json"]