--- a
+++ b/dosma/file_constants.py
@@ -0,0 +1,28 @@
+"""Basic file constants to be shared with program"""
+
+import os
+
+# Elastix files
+
+__DIR__ = os.path.abspath(os.path.dirname(__file__))
+__OUT_DIR__ = os.path.abspath(os.path.expanduser("~/.dosma"))
+_DOSMA_ELASTIX_FOLDER = os.path.join(__DIR__, "resources/elastix")
+__PATH_TO_ELASTIX_FOLDER__ = os.path.join(__DIR__, "resources/elastix/params")
+
+ELASTIX_AFFINE_PARAMS_FILE = os.path.join(__PATH_TO_ELASTIX_FOLDER__, "parameters-affine.txt")
+ELASTIX_BSPLINE_PARAMS_FILE = os.path.join(__PATH_TO_ELASTIX_FOLDER__, "parameters-bspline.txt")
+ELASTIX_RIGID_PARAMS_FILE = os.path.join(__PATH_TO_ELASTIX_FOLDER__, "parameters-rigid.txt")
+
+ELASTIX_AFFINE_INTERREGISTER_PARAMS_FILE = os.path.join(
+    __PATH_TO_ELASTIX_FOLDER__, "parameters-affine-interregister.txt"
+)
+ELASTIX_RIGID_INTERREGISTER_PARAMS_FILE = os.path.join(
+    __PATH_TO_ELASTIX_FOLDER__, "parameters-rigid-interregister.txt"
+)
+
+MAPSS_ELASTIX_AFFINE_INTERREGISTER_PARAMS_FILE = os.path.join(
+    __PATH_TO_ELASTIX_FOLDER__, "parameters-affine-interregister.txt"
+)
+MAPSS_ELASTIX_RIGID_INTERREGISTER_PARAMS_FILE = os.path.join(
+    __PATH_TO_ELASTIX_FOLDER__, "parameters-rigid-interregister.txt"
+)