diff --git a/src/manage/install_command.py b/src/manage/install_command.py
index 0a1958a..5dea298 100644
--- a/src/manage/install_command.py
+++ b/src/manage/install_command.py
@@ -216,7 +216,8 @@ def _calc(prefix, filename, calculate_dest=calculate_dest):
 
 
 def _if_exists(launcher, plat):
-    plat_launcher = launcher.parent / f"{launcher.stem}{plat}{launcher.suffix}"
+    suffix = "." + launcher.suffix.lstrip(".")
+    plat_launcher = launcher.parent / f"{launcher.stem}{plat}{suffix}"
     if plat_launcher.is_file():
         return plat_launcher
     return launcher