import openpyxl, os

base = r'C:\Users\renet\.openclaw\workspace\buchhaltungs-app'
for f in sorted(os.listdir(base)):
    if not f.endswith('.xlsx'):
        continue
    fp = os.path.join(base, f)
    size_mb = os.path.getsize(fp) / 1024 / 1024
    print(f'\n{"="*60}')
    print(f'FILE: {f} ({size_mb:.1f} MB)')
    try:
        wb = openpyxl.load_workbook(fp, data_only=True, read_only=True)
        print(f'Sheets: {wb.sheetnames}')
        for sn in wb.sheetnames:
            ws = wb[sn]
            print(f'\n  Sheet "{sn}":')
            count = 0
            for row in ws.iter_rows(max_row=25, values_only=True):
                vals = [v for v in row if v is not None]
                if vals:
                    print(f'    {vals}')
                    count += 1
                if count >= 20:
                    break
        wb.close()
    except Exception as e:
        print(f'ERROR: {e}')