diff --git a/archive/pc_archive.c b/archive/pc_archive.c
index 7f97841..8708950 100644
--- a/archive/pc_archive.c
+++ b/archive/pc_archive.c
@@ -1516,21 +1516,6 @@ detect_type_by_data(uchar_t *buf, size_t len)
 			return (TYPE_BINARY|TYPE_BMP);
 	}
 
-	// MSDOS COM types
-	if (buf[0] == 0xe9 || buf[0] == 0xeb) {
-		if (LE16(U16_P(buf + 0x1fe)) == 0xaa55)
-			return (TYPE_BINARY|TYPE_EXE32); // MSDOS COM
-		else
-			return (TYPE_BINARY);
-	}
-	if (U16_P(buf + 2) == COM_MAGIC || U16_P(buf + 4) == COM_MAGIC ||
-	    U16_P(buf + 4) == COM_MAGIC || U16_P(buf + 5) == COM_MAGIC ||
-	    U16_P(buf + 13) == COM_MAGIC || U16_P(buf + 18) == COM_MAGIC ||
-	    U16_P(buf + 23) == COM_MAGIC || U16_P(buf + 30) == COM_MAGIC ||
-	    U16_P(buf + 70) == COM_MAGIC) {
-			return (TYPE_BINARY|TYPE_EXE32); // MSDOS COM
-	}
-
 	if (U32_P(buf) == TZINT)
 		return (TYPE_BINARY); // Timezone data
 	if (U32_P(buf) == PPMINT)
@@ -1538,5 +1523,21 @@ detect_type_by_data(uchar_t *buf, size_t len)
 	if (U32_P(buf) == WVPK || U32_P(buf) == TTA1)
 		return (TYPE_BINARY|TYPE_COMPRESSED|TYPE_AUDIO_COMPRESSED);
 
+	// MSDOS COM types, two byte and one byte magic numbers are checked 
+        // after all other multi-byte magic number checks.
+	if (buf[0] == 0xe9 || buf[0] == 0xeb) {
+		if (LE16(U16_P(buf + 0x1fe)) == 0xaa55)
+			return (TYPE_BINARY|TYPE_EXE32); // MSDOS COM
+		else
+			return (TYPE_BINARY);
+	}
+
+	if (U16_P(buf + 2) == COM_MAGIC || U16_P(buf + 4) == COM_MAGIC ||
+	    U16_P(buf + 4) == COM_MAGIC || U16_P(buf + 5) == COM_MAGIC ||
+	    U16_P(buf + 13) == COM_MAGIC || U16_P(buf + 18) == COM_MAGIC ||
+	    U16_P(buf + 23) == COM_MAGIC || U16_P(buf + 30) == COM_MAGIC ||
+	    U16_P(buf + 70) == COM_MAGIC) {
+			return (TYPE_BINARY|TYPE_EXE32); // MSDOS COM
+	}
 	return (TYPE_UNKNOWN);
 }
diff --git a/lzma_compress.c b/lzma_compress.c
index c016820..b113eb0 100644
--- a/lzma_compress.c
+++ b/lzma_compress.c
@@ -211,7 +211,7 @@ lzma_compress(void *src, uint64_t srclen, void *dst,
 		return (-1);
 	}
 
-	if (PC_SUBTYPE(btype) == TYPE_COMPRESSED_LZMA)
+	if (PC_SUBTYPE(btype) == TYPE_COMPRESSED_ZPAQ)
 		return (-1);
 	props->level = level;
 
diff --git a/pcompress.c b/pcompress.c
index ff83e79..4cd9625 100644
--- a/pcompress.c
+++ b/pcompress.c
@@ -1990,6 +1990,14 @@ start_compress(pc_ctx_t *pctx, const char *filename, uint64_t chunksize, int lev
 			props.is_single_chunk = 1;
 			flags |= FLAG_SINGLE_CHUNK;
 
+			/*
+			 * Disable deduplication if file is too small.
+			 */
+			if (chunksize < RAB_MIN_CHUNK_SIZE) {
+				pctx->enable_rabin_scan = 0;
+				pctx->enable_rabin_global = 0;
+			}
+
 			/*
 			 * Switch to simple Deduplication if global is enabled.
 			 */
@@ -2799,7 +2807,7 @@ init_pc_context_argstr(pc_ctx_t *pctx, char *args)
 int DLL_EXPORT
 init_pc_context(pc_ctx_t *pctx, int argc, char *argv[])
 {
-	int opt, num_rem, err, my_optind, advanced_opts;
+	int opt, num_rem, err, my_optind;
 	char *pos;
 	struct filter_flags ff;
 
@@ -2812,7 +2820,7 @@ init_pc_context(pc_ctx_t *pctx, int argc, char *argv[])
 	while (*pos != '/' && pos > argv[0]) pos--;
 	if (*pos == '/') pos++;
 	strcpy(pctx->exec_name, pos);
-	advanced_opts = 0;
+	pctx->advanced_opts = 0;
 	ff.enable_packjpg = 0;
 
 	pthread_mutex_lock(&opt_parse);
@@ -2865,7 +2873,7 @@ init_pc_context(pc_ctx_t *pctx, int argc, char *argv[])
 			break;
 
 		    case 'B':
-			advanced_opts = 1;
+			pctx->advanced_opts = 1;
 			pctx->rab_blk_size = atoi(optarg);
 			if (pctx->rab_blk_size < 0 || pctx->rab_blk_size > 5) {
 				log_msg(LOG_ERR, 0, "Average Dedupe block size must be in range 0 (2k), 1 (4k) .. 5 (64k)");
@@ -2894,17 +2902,17 @@ init_pc_context(pc_ctx_t *pctx, int argc, char *argv[])
 			break;
 
 		    case 'D':
-			advanced_opts = 1;
+			pctx->advanced_opts = 1;
 			pctx->enable_rabin_scan = 1;
 			break;
 
 		    case 'G':
-			advanced_opts = 1;
+			pctx->advanced_opts = 1;
 			pctx->enable_rabin_global = 1;
 			break;
 
 		    case 'E':
-			advanced_opts = 1;
+			pctx->advanced_opts = 1;
 			pctx->enable_rabin_scan = 1;
 			if (!pctx->enable_delta_encode)
 				pctx->enable_delta_encode = DELTA_NORMAL;
@@ -2926,18 +2934,18 @@ init_pc_context(pc_ctx_t *pctx, int argc, char *argv[])
 			break;
 
 		    case 'F':
-			advanced_opts = 1;
+			pctx->advanced_opts = 1;
 			pctx->enable_fixed_scan = 1;
 			pctx->enable_rabin_split = 0;
 			break;
 
 		    case 'L':
-			advanced_opts = 1;
+			pctx->advanced_opts = 1;
 			pctx->lzp_preprocess = 1;
 			break;
 
 		    case 'P':
-			advanced_opts = 1;
+			pctx->advanced_opts = 1;
 			pctx->enable_delta2_encode = 1;
 			break;
 
@@ -2979,12 +2987,12 @@ init_pc_context(pc_ctx_t *pctx, int argc, char *argv[])
 			break;
 
 		    case 'j':
-			advanced_opts = 1;
+			pctx->advanced_opts = 1;
 			ff.enable_packjpg = 1;
 			break;
 
 		    case 'x':
-			advanced_opts = 1;
+			pctx->advanced_opts = 1;
 			pctx->dispack_preprocess = 1;
 			break;
 
@@ -3252,7 +3260,7 @@ init_pc_context(pc_ctx_t *pctx, int argc, char *argv[])
 		 * Auto-select filters and preprocessing modes based on compresion level.
 		 * This is not done if user explicitly specified advanced options.
 		 */
-		if (!advanced_opts) {
+		if (!pctx->advanced_opts) {
 			/*
 			 * Selectively enable filters while archiving, depending on compression level.
 			 */
diff --git a/pcompress.h b/pcompress.h
index 065dac7..2561248 100644
--- a/pcompress.h
+++ b/pcompress.h
@@ -215,6 +215,7 @@ typedef struct pc_ctx {
 	int pagesize;
 	int force_archive_perms;
 	int no_overwrite_newer;
+	int advanced_opts;
 
 	/*
 	 * Archiving related context data.
diff --git a/utils/phash/extensions.h b/utils/phash/extensions.h
index f16aab1..e4c239b 100644
--- a/utils/phash/extensions.h
+++ b/utils/phash/extensions.h
@@ -68,6 +68,7 @@ struct ext_entry {
 	{"ps"	, TYPE_TEXT, 2},
 	{"bib"	, TYPE_TEXT, 3},
 	{"lua"	, TYPE_TEXT, 3},
+	{"dtd"	, TYPE_TEXT, 3},
 	{"qml"	, TYPE_TEXT|TYPE_MARKUP, 3},
 	{"fa"	, TYPE_TEXT|TYPE_DNA_SEQ, 2},
 	{"faa"	, TYPE_TEXT|TYPE_DNA_SEQ, 3},
diff --git a/utils/phash/extensions.txt b/utils/phash/extensions.txt
index 0b6c62b..22a8943 100644
--- a/utils/phash/extensions.txt
+++ b/utils/phash/extensions.txt
@@ -55,6 +55,7 @@ s,TYPE_TEXT
 ps,TYPE_TEXT
 bib,TYPE_TEXT
 lua,TYPE_TEXT
+dtd,TYPE_TEXT
 qml,TYPE_TEXT|TYPE_MARKUP
 
 # These are all genomic data file extensions
diff --git a/utils/phash/phash.c b/utils/phash/phash.c
index 1dd8ad6..3e3b889 100644
--- a/utils/phash/phash.c
+++ b/utils/phash/phash.c
@@ -12,14 +12,14 @@
 
 /* small adjustments to _a_ to make values distinct */
 ub1 tab[] = {
-125,0,0,220,125,113,82,82,113,0,0,7,0,0,113,125,
-0,0,7,87,0,113,0,0,0,125,0,131,0,7,125,22,
-0,0,0,0,85,0,0,0,0,113,87,113,0,7,22,0,
-82,0,113,113,125,125,0,0,0,0,113,7,85,0,0,85,
-0,82,0,0,113,0,125,183,82,85,124,88,58,183,0,0,
-124,0,113,125,0,125,0,116,0,82,125,74,0,125,0,32,
-0,113,113,124,0,85,0,0,42,61,0,87,0,40,183,61,
-0,0,0,0,0,61,0,0,56,11,0,0,164,200,0,0,
+125,0,0,220,125,0,82,82,113,0,0,113,0,0,113,125,
+0,0,7,32,0,113,82,0,0,183,0,131,0,7,220,120,
+0,0,0,0,85,0,0,0,0,113,125,113,0,7,22,0,
+82,0,7,113,125,125,0,0,0,113,113,85,220,0,0,85,
+0,82,0,0,113,0,85,183,82,88,11,85,55,113,0,0,
+124,0,113,125,0,125,0,235,0,82,125,55,0,22,0,92,
+0,125,113,7,0,40,0,0,82,61,0,42,0,11,177,15,
+0,0,0,0,0,6,0,0,56,11,0,0,164,47,0,0,
 };
 
 /* The hash function */
diff --git a/utils/phash/phash.h b/utils/phash/phash.h
index 74e2f2f..11a1ffc 100644
--- a/utils/phash/phash.h
+++ b/utils/phash/phash.h
@@ -8,7 +8,7 @@
 
 extern ub1 tab[];
 #define PHASHLEN 0x80  /* length of hash mapping table */
-#define PHASHNKEYS 136  /* How many keys were hashed */
+#define PHASHNKEYS 137  /* How many keys were hashed */
 #define PHASHRANGE 256  /* Range any input might map to */
 #define PHASHSALT 0x9e3779b9 /* internal, initialize normal hash */