title: FileNotFoundError, but file DOES EXIST
body: <p>I am trying to load <code>.dcm</code> file in my Jupyter Notebook, but I am getting <code>FileNotFound</code> error, <strong>even though file DOES exist</strong>! I've checked by opening it in the DICOM viewer. Code is pretty simple:</p>
  <pre><code>image = pydicom.dcmread(dicom_filename).pixel_array
  </code></pre>
  <p>Here is the error message:</p>
  <pre><code>FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\StefanCepa995\\Desktop\\Machine Learning\\Projects\\Computer Vision\\Breast Mammography Analysis\\Data\\CBIS-DDSM\\dicom_files\\Mass-Training_Full_Mammogram_Images\\Mass-Training_P_00001_LEFT_CC\\07-20-2016-DDSM-74994\\1.000000-full mammogram images-24515\\1-1.dcm'
  </code></pre>
  <p>Funny part is, I've tried listing all files in <code>C:\\Users\\StefanCepa995\\Desktop\\Machine Learning\\Projects\\Computer Vision\\Breast Mammography Analysis\\Data\\CBIS-DDSM\\dicom_files\\</code> directory, and <code>os.walk()</code> lists all <code>.dcm</code> files, but when I use <code>os.path.exists()</code> on one of those files I am getting False as return value:</p>
  <pre><code>for root, dirs, files in os.walk(cbis_ddsm_dicom_mass_train_dir):
      for f in files:
          file_path = os.path.join(root, f)
          print(file_path)
          print(os.path.exists(file_path))
  
  C:\Users\StefanCepa995\Desktop\Machine Learning\Projects\Computer Vision\Breast Mammography Analysis\Data\CBIS-DDSM\dicom_files\Mass-Training_Full_Mammogram_Images\Mass-Training_P_00001_LEFT_CC\07-20-2016-DDSM-74994\1.000000-full mammogram images-24515\1-1.dcm
  False
  C:\Users\StefanCepa995\Desktop\Machine Learning\Projects\Computer Vision\Breast Mammography Analysis\Data\CBIS-DDSM\dicom_files\Mass-Training_Full_Mammogram_Images\Mass-Training_P_00001_LEFT_MLO\07-20-2016-DDSM-90988\1.000000-full mammogram images-80834\1-1.dcm
  False
  C:\Users\StefanCepa995\Desktop\Machine Learning\Projects\Computer Vision\Breast Mammography Analysis\Data\CBIS-DDSM\dicom_files\Mass-Training_Full_Mammogram_Images\Mass-Training_P_00004_LEFT_CC\07-20-2016-DDSM-95697\1.000000-full mammogram images-46540\1-1.dcm
  False
  C:\Users\StefanCepa995\Desktop\Machine Learning\Projects\Computer Vision\Breast Mammography Analysis\Data\CBIS-DDSM\dicom_files\Mass-Training_Full_Mammogram_Images\Mass-Training_P_00004_LEFT_MLO\07-20-2016-DDSM-20939\1.000000-full mammogram images-00162\1-1.dcm
  False
  </code></pre>