--- a/PCFilename.st	Thu Nov 13 11:45:07 2014 +0100
+++ b/PCFilename.st	Thu Nov 13 12:11:08 2014 +0100
@@ -160,42 +160,49 @@
      This is used, if no special preferences were defined in
      any of the TEMP-environment variables (see tempDirectory)."
 
-    |winDir vol tempDir|
+    |winDir vol tempDirString tempDir|
+
+    "/ if no explicit temp dir environment variable has been specified,
+    "/ use the ALLUSERS common folder and create an stx_tmp folder there.
+    "/ this will only happen for services which are installed to run under system
+    "/ instead of under any particular user.
 
-    #('TMPDIR' 'TEMPDIR' 'TEMP' 'TMP') do:[:envVar |
-	tempDir isNil ifTrue:[
-	    tempDir := OperatingSystem getEnvironment:envVar.
-	    tempDir notNil ifTrue:[
-		"/ kludge when running cygwin: replace '/cygdrive/X/...'
-		"/ by X:\...
-		(tempDir startsWith:'/cygdrive/') ifTrue:[
-		    tempDir := tempDir withoutPrefix:'/cygdrive/'.
-		    tempDir size > 2 ifTrue:[
-			(tempDir at:2) == $/ ifTrue:[
-			    tempDir := (tempDir at:1) asString , ':' ,
-				       ((tempDir copyFrom:2) replaceAll:$/ with:$\).
-			].
-		    ].
-		].
-		tempDir asFilename exists ifTrue:[
-		    ^ tempDir asFilename.
-		].
-	    ].
-	].
+    #('STX_TMPDIR' 'ST_TMPDIR' 'TMPDIR' 'TEMPDIR' 'TEMP' 'TMP' 'ALLUSERSPROFILE') do:[:envVar |
+        tempDirString := OperatingSystem getEnvironment:envVar.
+        tempDirString notNil ifTrue:[
+            "/ kludge when running cygwin: replace '/cygdrive/X/...'
+            "/ by X:\...
+            (tempDirString startsWith:'/cygdrive/') ifTrue:[
+                tempDirString := tempDirString withoutPrefix:'/cygdrive/'.
+                tempDirString size > 2 ifTrue:[
+                    (tempDirString at:2) == $/ ifTrue:[
+                        tempDirString := (tempDirString at:1) asString , ':' ,
+                                   ((tempDirString copyFrom:2) replaceAll:$/ with:$\).
+                    ].
+                ].
+            ].
+            tempDir := self named:tempDirString.    
+            (tempDir exists and:[ tempDir isWritable ]) ifTrue:[
+                ('Filename [info]: using tmp folder as specified by: ',envVar) infoPrintCR.
+                ^ tempDir asFilename.
+            ].
+        ].
     ].
 
     winDir := OperatingSystem getWindowsDirectory asFilename.
     vol := winDir volume.
     tempDir := vol asFilename construct:'temp'.
-    tempDir exists ifTrue:[ ^tempDir ].
-
-    tempDir := vol asFilename construct:'tmp'.
-    tempDir exists ifTrue:[ ^tempDir ].
-
-    tempDir := winDir construct:'temp'.
-    tempDir exists ifTrue:[ ^tempDir ].
-
-    ^ '.\temp' asFilename
+    (tempDir exists and:[ tempDir isWritable ]) ifFalse:[ 
+        tempDir := vol asFilename construct:'tmp'.
+        (tempDir exists and:[ tempDir isWritable ]) ifFalse:[ 
+            tempDir := winDir construct:'temp'.
+            (tempDir exists and:[ tempDir isWritable ]) ifFalse:[
+                tempDir := '.\temp' asFilename
+            ]
+        ]
+    ].
+    ('Filename [info]: using fallback windows tmp folder: ',tempDir pathName) infoPrintCR.
+    ^ tempDir    
 
     "
      Filename defaultTempDirectoryName
@@ -917,14 +924,14 @@
 !PCFilename class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/libbasic/PCFilename.st,v 1.63 2014-07-24 13:19:05 ab Exp $'
+    ^ '$Header: /cvs/stx/stx/libbasic/PCFilename.st,v 1.64 2014-11-13 11:11:08 cg Exp $'
 !
 
 version_CVS
-    ^ '$Header: /cvs/stx/stx/libbasic/PCFilename.st,v 1.63 2014-07-24 13:19:05 ab Exp $'
+    ^ '$Header: /cvs/stx/stx/libbasic/PCFilename.st,v 1.64 2014-11-13 11:11:08 cg Exp $'
 !
 
 version_SVN
-    ^ '$Id: PCFilename.st,v 1.63 2014-07-24 13:19:05 ab Exp $'
+    ^ '$Id: PCFilename.st,v 1.64 2014-11-13 11:11:08 cg Exp $'
 ! !