--- a/src/dmpack.c	Sun Mar 01 17:47:50 2015 +0200
+++ b/src/dmpack.c	Sun Mar 01 18:03:08 2015 +0200
@@ -78,27 +78,32 @@
     // Allocate packfile-structure
     if ((pack = dmMalloc0(sizeof(DMPackFile))) == NULL)
     {
-        ret = DMERR_MALLOC;
+        ret = dmErrorDBG(DMERR_MALLOC,
+            "Failed to allocate memory for PACK file structure '%s'.\n",
+            filename);
         goto out;
     }
 
     // Open the file
     if ((pack->file = fopen(filename, readOnly ? "rb" : "r+b")) == NULL)
     {
-        ret = DMERR_FOPEN;
+        ret = dmErrorDBG(dmGetErrno(),
+            "Failed to open PACK file '%s'.\n",
+            filename);
         goto out;
     }
 
     pack->filename = dm_strdup(filename);
 
     // Read PACK header
-    fseek(pack->file, 0L, SEEK_SET);
+    DM_FSEEK64(pack->file, 0L, SEEK_SET);
     if (!dm_fread_str(pack->file, (Uint8 *) &hdr.ident, sizeof(hdr.ident)) ||
         !dm_fread_le16(pack->file, &hdr.version) ||
         !dm_fread_le32(pack->file, &hdr.dirEntries) ||
         !dm_fread_le64(pack->file, &hdr.dirOffset))
     {
-        ret = DMERR_FREAD;
+        ret = dmErrorDBG(DMERR_FREAD,
+            "Error reading PACK file header data.\n");
         goto out;
     }
 
@@ -117,9 +122,11 @@
 
     // Read directory
     if (hdr.dirOffset < sizeof(hdr) ||
-        fseek(pack->file, hdr.dirOffset, SEEK_SET) != 0)
+        DM_FSEEK64(pack->file, hdr.dirOffset, SEEK_SET) != 0)
     {
-        ret = DMERR_INVALID;
+        ret = dmErrorDBG(DMERR_INVALID,
+            "Error seeking to PACK file '%s' directory offset.\n",
+            filename); 
         goto out;
     }