diff --git a/flopy/mbase.py b/flopy/mbase.py
index 99e32bf1f..1d541e128 100644
--- a/flopy/mbase.py
+++ b/flopy/mbase.py
@@ -79,9 +79,11 @@ def _resolve(exe_name):
         ):  # mode=0 effectively allows which() to find exe without suffix in windows
             return exe
 
-        # try removing .exe suffix
-        if exe_name.lower().endswith(".exe"):
+        # try adding/removing .exe suffix
+        if on_windows and exe_name.lower().endswith(".exe"):
             return _resolve(exe_name[:-4])
+        elif on_windows and "." not in Path(exe_name).stem:
+            return _resolve(f"{exe_name}.exe")
 
     exe_path = _resolve(exe_name)