Index: kitsh/buildsrc/kitsh-0.0/boot.tcl
==================================================================
--- kitsh/buildsrc/kitsh-0.0/boot.tcl
+++ kitsh/buildsrc/kitsh-0.0/boot.tcl
@@ -97,14 +97,16 @@
 			unset -nocomplain ::tclkit_system_encoding
 		}
 
 		# If we've still not been able to set the encoding, revert to Tclkit defaults
 		if {[encoding system] eq "identity"} {
-			switch $::tcl_platform(platform) {
-				windows		{ encoding system cp1252 }
-				macintosh	{ encoding system macRoman }
-			        default		{ encoding system iso8859-1 }
+			catch {
+				switch $::tcl_platform(platform) {
+					windows		{ encoding system cp1252 }
+					macintosh	{ encoding system macRoman }
+				        default		{ encoding system iso8859-1 }
+				}
 			}
 		}
 
 		# now remount the executable with the correct encoding
 		vfs::filesystem unmount [lindex [::vfs::filesystem info] 0]

Index: kitsh/buildsrc/kitsh-0.0/zipvfs.tcl
==================================================================
--- kitsh/buildsrc/kitsh-0.0/zipvfs.tcl
+++ kitsh/buildsrc/kitsh-0.0/zipvfs.tcl
@@ -103,10 +103,14 @@
 	    if {![::zip::exists $zipfd $name]} {
 		vfs::filesystem posixerror $::vfs::posix(ENOENT)
 	    }
 	    
 	    ::zip::stat $zipfd $name sb
+
+            if {$sb(ino) == -1} {
+                vfs::filesystem posixerror $::vfs::posix(EISDIR)
+            }
 
 	    set nfd [vfs::memchan]
 	    fconfigure $nfd -translation binary
 
 	    seek $zipfd $sb(ino) start