diff --git a/pype/hooks/celaction/prelaunch.py b/pype/hooks/celaction/prelaunch.py
index ffd3a78bf3..55956a7481 100644
--- a/pype/hooks/celaction/prelaunch.py
+++ b/pype/hooks/celaction/prelaunch.py
@@ -65,7 +65,7 @@ class CelactionPrelaunchHook(PypeHook):
 
         workfile_path = os.path.join(workdir, workfile)
 
-        # create workfile from template if doesnt exist any on path
+        # copy workfile from template if doesnt exist any on path
         if not os.path.isfile(workfile_path):
             # try to get path from environment or use default
             # from `pype.celation` dir
@@ -81,6 +81,9 @@ class CelactionPrelaunchHook(PypeHook):
 
         self.log.info(f"Workfile to open: `{workfile_path}`")
 
+        # adding compulsory environment var for openting file
+        env["PYPE_CELACTION_PROJECT_FILE"] = workfile_path
+
         # setting output parameters
         path = r"Software\CelAction\CelAction2D\User Settings"
         winreg.CreateKey(winreg.HKEY_CURRENT_USER, path)