Index: tol/stdlib/general/TolPackage/builder.tol
===================================================================
--- tol/stdlib/general/TolPackage/builder.tol	(revision c4a6b78200076a4a5175686d3d381d2b02f9003c)
+++ tol/stdlib/general/TolPackage/builder.tol	(revision c13253cdb685d5ba0d5cfa7fe939a0cd3c0faa47)
@@ -177,5 +177,6 @@
       OSDirCopy(orig,dest)
     });
-    Real PackArchive::PackFull("ZipArchive", ppRoot_);
+    Text ppr = ReplaceSlash(ppRoot_);
+    Real PackArchive::PackFull("ZipArchive", ppr);
     Real OSDirRemove(ppRoot);
     True