Rob,
I think Scott found the issue.  Your dump shows an entry.d_name of '.   ' with an entry.c_namelen of 1.
So your starting %subst position will be -2 (name:entry.d_namelen-3 = -2).
Maybe adding an additional if statement group?
     if (entry.d_namelen > 4) // A directory has at least a single character name
       name = %subst(entry.d_name: 1: entry.d_namelen);
       if %xlate(lo:up:%subst(name:entry.d_namelen-3:4))='.NSF';
         except print;
       endif;
     endif;
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Scott Mildenberger
Sent: Tuesday, November 20, 2012 12:29 PM
To: RPG programming on the IBM i / System i
Subject: RE: MCH1210 - Receiver value too small to hold result.
Can you step into the procedure in debug to see where in the procedure the error is occurring.  I do see that the entry you are processing has a name of '.' and a namelen of 1, it doesn't look like your program expects that.  This will give you a negative starting position in the %subst at line 70, not sure if that would cause the error you get.
Scott Mildenberger
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx<mailto:rpg400-l-bounces@xxxxxxxxxxxx>
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx<mailto:rob@xxxxxxxxx>
Sent: Tuesday, November 20, 2012 1:16 PM
To: rpg400-l@xxxxxxxxxxxx<mailto:rpg400-l@xxxxxxxxxxxx>
Subject: MCH1210 - Receiver value too small to hold result.
I am getting a MCH1210 error
Statement in Error . . . . . . . . . . :   00001273
RPG Routine  . . . . . . . . . . . . . :   DRILLDOW
Number of Parameters . . . . . . . . . :
Message Type . . . . . . . . . . . . . :   MCH
Additional Message Info  . . . . . . . :   1210
Message Data . . . . . . . . . . . . . :
              Receiver value too small to hold result.
DrillDown(DirectoryName); // MCH1210 error here!!!!!
Source listing
http://code.midrange.com/2c08ed8d39.html
Compile listing
http://code.midrange.com/598444bec7.html
Dump
http://code.midrange.com/24669d27c8.html
Rob Berendt
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