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--- a/src/windows/execmd_w.cpp
+++ b/src/windows/execmd_w.cpp
@@ -401,7 +401,7 @@
         pep = &s_pathelts;
     }
 
-    if (cmd.find_first_of("/\\") != string::npos) {
+    if (path_isabsolute(cmd)) {
         if (is_exe_base(cmd)) {
             exe = cmd;
             return true;