diff --git a/modules/diskdump/lib/diskdump.js b/modules/diskdump/lib/diskdump.js
index 1eb18fb52..f87e2e57f 100644
--- a/modules/diskdump/lib/diskdump.js
+++ b/modules/diskdump/lib/diskdump.js
@@ -109,7 +109,7 @@ function DiskDump(sDiskPath, asExclude, sFormat, fComments, mbHD, sServerRoot, s
      */
     this.sServerRoot = sServerRoot;
     this.sDiskPath = (net.isRemote(sDiskPath)? sDiskPath : path.join(this.sServerRoot, sDiskPath));
-    this.asExclude = asExclude;
+    this.asExclude = asExclude || DiskDump.asExclusions;
     this.mbHD = mbHD? parseInt(mbHD, 10) : 0;
     this.sFormat = (sFormat || DumpAPI.FORMAT.JSON);
     this.fJSONNative = (this.sFormat == DumpAPI.FORMAT.JSON && !fComments);
@@ -276,6 +276,9 @@ DiskDump.aDefaultBPBs = [
   ]
 ];
 
+DiskDump.asExclusions = [".*", ".IMG"];
+DiskDump.asTextFileExts = [".MD", ".ME", ".ASM", ".BAS", ".TXT", ".XML"];
+
 /*
  * Class methods
  */
@@ -788,9 +791,16 @@ DiskDump.readFile = function(sPath, sEncoding, done)
  */
 DiskDump.prototype.isExcluded = function(sName)
 {
-    if (this.asExclude) {
-        for (var i = 0; i < this.asExclude.length; i++) {
-            if (sName.toUpperCase() == this.asExclude[i].toUpperCase()) return true;
+    sName = sName.toUpperCase();
+    for (var i = 0; i < this.asExclude.length; i++) {
+        var sExclude = this.asExclude[i].toUpperCase();
+        if (sName == sExclude) return true;
+        if (sExclude.charAt(0) == '.') {
+            if (sExclude.charAt(1) == '*') {
+                if (sName.charAt(0) == '.') return true;
+            } else {
+                if (str.endsWith(sName, sExclude)) return true;
+            }
         }
     }
     return false;
@@ -1162,8 +1172,6 @@ DiskDump.prototype.addManifestInfo = function(fileInfo)
     this.aManifestInfo.push(fileInfo);
 };
 
-DiskDump.asTextFileExts = [".MD", ".ME", ".ASM", ".BAS", ".TXT", ".XML"];
-
 /**
  * isTextFile(sFileName)
  *
diff --git a/tests/pc/vga/README.md b/tests/pc/vga/README.md
index f41366a3b..4c56fb9e0 100644
--- a/tests/pc/vga/README.md
+++ b/tests/pc/vga/README.md
@@ -40,7 +40,12 @@ assumed to be a directory, and so PCjs will ask the server to enumerate the cont
 JSON-encoded disk image containing all the files in that directory (including any subdirectories).
 
 Since the contents of this directory will probably be in flux for a while, I've opted for this approach.  Once
-things settle down, I'll generate a JSON-encoded disk image containing a snapshot of this directory.
+things settle down, I'll generate a JSON-encoded disk image containing a snapshot of this directory, like so:
+
+	diskdump --dir=. --format=img --output=TESTVGA.img
+
+One advantage of using the PCjs [DiskDump](/modules/diskdump/) module is that it automatically converts linefeeds in
+known text files (including ASM files) into DOS-compatible CR/LF sequences.
 
 I've updated a [Compaq DeskPro 386 Machine](/devices/pc/machine/compaq/deskpro386/vga/2048kb/) to use the
 [Library](/disks/pc/library.xml) disk collection and automatically load the above disk: