Index: trunk/psphot/src/psphotSubtractBackground.c
===================================================================
--- trunk/psphot/src/psphotSubtractBackground.c	(revision 32348)
+++ trunk/psphot/src/psphotSubtractBackground.c	(revision 34528)
@@ -21,5 +21,5 @@
 
     // find the currently selected readout (XXX note that the model is saved on PSPHOT.BACKMDL regardless of 'filename'
-    pmFPAfile *modelFile = pmFPAfileSelectSingle(config->files, "PSPHOT.BACKMDL", index); // File of interest
+    pmFPAfile *modelFile = pmFPAfileSelectSingle(config->files, psphotGetFilerule("PSPHOT.BACKMDL"), index); // File of interest
     assert (modelFile);
 
@@ -36,5 +36,5 @@
     // select background pixels, from output background file, or create
     // XXX for now, we will only allow a single background image to be generated
-    file = psMetadataLookupPtr (&status, config->files, "PSPHOT.BACKGND");
+    file = psMetadataLookupPtr (&status, config->files, psphotGetFilerule("PSPHOT.BACKGND"));
     if (file) {
         // we are using PSPHOT.BACKGND as an I/O file: select readout or create
@@ -50,5 +50,5 @@
         }
     } else {
-        background = pmFPAfileDefineInternal (config->files, "PSPHOT.BACKGND", image->numCols, image->numRows, PS_TYPE_F32);
+        background = pmFPAfileDefineInternal (config->files, psphotGetFilerule("PSPHOT.BACKGND"), image->numCols, image->numRows, PS_TYPE_F32);
     }
     psF32 **backData = background->image->data.F32;