diff --git a/invesalius/gui/dialogs.py b/invesalius/gui/dialogs.py
index 4742f89..bbbeed0 100644
--- a/invesalius/gui/dialogs.py
+++ b/invesalius/gui/dialogs.py
@@ -213,15 +213,15 @@ class ProgressDialog(object):
 WILDCARD_OPEN = "InVesalius 3 project (*.inv3)|*.inv3|" \
                 "All files (*.*)|*.*"
 
-WILDCARD_ANALYZE = "Analyze 7.5 (*.hdr)|*.[hH][dD][rR]|" \
+WILDCARD_ANALYZE = "Analyze 7.5 (*.hdr)|*.hdr|" \
                    "All files (*.*)|*.*"
 
 WILDCARD_NIFTI = "NIfTI 1 (*.nii)|*.nii|" \
                  "Compressed NIfTI (*.nii.gz)|*.nii.gz|" \
-                 "HDR NIfTI (*.hdr)|*.[hH][dD][rR]|" \
+                 "HDR NIfTI (*.hdr)|*.hdr|" \
                  "All files (*.*)|*.*"
 #".[jJ][pP][gG]"
-WILDCARD_PARREC = "PAR/REC (*.par)|*.[pP][aA][rR]|" \
+WILDCARD_PARREC = "PAR/REC (*.par)|*.par|" \
                   "All files (*.*)|*.*"
 
 WILDCARD_MESH_FILES = "STL File format (*.stl)|*.stl|" \
--
libgit2 0.21.2