diff --git a/trimage/tools.py b/trimage/tools.py
index f787c8c..98e0218 100644
--- a/trimage/tools.py
+++ b/trimage/tools.py
@@ -7,7 +7,6 @@ from subprocess import call, PIPE
 
 def check_dependencies():
     """Check if the required command line apps exist."""
-    exe = ".exe" if (sys.platform == "win32") else ""
     status = True
     dependencies = {
         "jpegoptim": "--version",
@@ -17,7 +16,7 @@ def check_dependencies():
     }
 
     for elt in dependencies:
-        retcode = safe_call(elt + exe + " " + dependencies[elt])
+        retcode = safe_call(elt + " " + dependencies[elt])
         if retcode != 0:
             status = False
             print("[error] please install {}".format(elt), file=sys.stderr)
@@ -43,4 +42,4 @@ def human_readable_size(num, suffix="B"):
         if abs(num) < 1024.0:
             return "%3.1f%s%s" % (num, unit, suffix)
         num /= 1024.0
-    return "%.1f%s%s" % (num, "Y", suffix)
\ No newline at end of file
+    return "%.1f%s%s" % (num, "Y", suffix)
diff --git a/trimage/trimage.py b/trimage/trimage.py
index 2fefedf..3f7dbc3 100644
--- a/trimage/trimage.py
+++ b/trimage/trimage.py
@@ -371,10 +371,9 @@ class Image:
             file)"
         self.reset()
         self.compressing = True
-        exe = ".exe" if (sys.platform == "win32") else ""
         runString = {
-            "jpeg": "jpegoptim" + exe + " -f --strip-all '%(file)s'",
-            "png": "optipng" + exe + " -force -o7 '%(file)s'&&advpng" + exe + " -z4 '%(file)s' && pngcrush -rem gAMA -rem alla -rem cHRM -rem iCCP -rem sRGB -rem time '%(file)s' '%(file)s.bak' && mv '%(file)s.bak' '%(file)s'"
+            "jpeg": "jpegoptim -f --strip-all '%(file)s'",
+            "png": "optipng -force -o7 '%(file)s'&&advpng -z4 '%(file)s' && pngcrush -rem gAMA -rem alla -rem cHRM -rem iCCP -rem sRGB -rem time '%(file)s' '%(file)s.bak' && mv '%(file)s.bak' '%(file)s'"
         }
         # create a backup file
         backupfullpath = '/tmp/' + self.filename_w_ext