diff --git a/usr.bin/mkuzip/mkuz_lzma.h b/usr.bin/mkuzip/mkuz_lzma.h
--- a/usr.bin/mkuzip/mkuz_lzma.h
+++ b/usr.bin/mkuzip/mkuz_lzma.h
@@ -26,14 +26,12 @@
  */
 
 /* Format L3.0, since we move to XZ API */
-#define CLOOP_MAGIC_LZMA \
-    "#!/bin/sh\n" \
-    "#L3.0\n" \
-    "n=uncompress\n" \
-    "m=geom_$n\n" \
-    "(kldstat -m $m 2>&-||kldload $m)>&-&&" \
-        "mount_cd9660 /dev/`mdconfig -af $0`.$n $1\n" \
-    "exit $?\n"
+#define CLOOP_MAGIC_LZMA        \
+    "#!/bin/sh\n"               \
+    "#L3.0\n"                   \
+    "[ -z \"$1\" ] && exit 1;"  \
+    "kldload -n geom_uzip && "
+
 #define DEFAULT_SUFX_LZMA   ".ulzma"
 
 size_t mkuz_lzma_cbound(size_t);
diff --git a/usr.bin/mkuzip/mkuz_zlib.h b/usr.bin/mkuzip/mkuz_zlib.h
--- a/usr.bin/mkuzip/mkuz_zlib.h
+++ b/usr.bin/mkuzip/mkuz_zlib.h
@@ -26,9 +26,11 @@
 
 #define DEFAULT_SUFX_ZLIB       ".uzip"
 
-#define CLOOP_MAGIC_ZLIB        "#!/bin/sh\n#V2.0 Format\n" \
-    "(kldstat -qm g_uzip||kldload geom_uzip)>&-&&" \
-    "mount_cd9660 /dev/`mdconfig -af $0`.uzip $1\nexit $?\n"
+#define CLOOP_MAGIC_ZLIB        \
+    "#!/bin/sh\n"               \
+    "#V2.0 Format\n"            \
+    "[ -z \"$1\" ] && exit 1;"  \
+    "kldload -n geom_uzip && "
 
 size_t mkuz_zlib_cbound(size_t);
 void *mkuz_zlib_init(int *);
diff --git a/usr.bin/mkuzip/mkuz_zstd.h b/usr.bin/mkuzip/mkuz_zstd.h
--- a/usr.bin/mkuzip/mkuz_zstd.h
+++ b/usr.bin/mkuzip/mkuz_zstd.h
@@ -27,9 +27,11 @@
 
 #define DEFAULT_SUFX_ZSTD       ".uzst"
 
-#define CLOOP_MAGIC_ZSTD        "#!/bin/sh\n#Z4.0 Format\n" \
-    "(kldstat -qm g_uzip||kldload geom_uzip)>&-&&" \
-    "mount_cd9660 /dev/`mdconfig -af $0`.uzip $1\nexit $?\n"
+#define CLOOP_MAGIC_ZSTD	\
+    "#!/bin/sh\n"		\
+    "#Z4.0 Format\n"		\
+    "[ -z \"$1\" ] && exit 1;"  \
+    "kldload -n geom_uzip && "
 
 size_t mkuz_zstd_cbound(size_t);
 void *mkuz_zstd_init(int *);
diff --git a/usr.bin/mkuzip/mkuzip.c b/usr.bin/mkuzip/mkuzip.c
--- a/usr.bin/mkuzip/mkuzip.c
+++ b/usr.bin/mkuzip/mkuzip.c
@@ -111,6 +111,64 @@
 	return (bp->info.blkno == *ap);
 }
 
+static int
+build_header(struct cloop_header *hdr, const struct mkuz_format *handler,
+    const char *file)
+{
+	int n;
+	FILE *fp;
+	char fstyp_cmd[MAXPATHLEN];
+	char fstyp_result[8];
+
+	snprintf(fstyp_cmd, sizeof(fstyp_cmd), "fstyp -u %s 2>/dev/null", file);
+	fp = popen(fstyp_cmd, "r");
+	if (fp == NULL)
+		return (-1);
+
+	if (fgets(fstyp_result, sizeof(fstyp_result), fp) == NULL) {
+		fclose(fp);
+		return (-1);
+	}
+
+	fstyp_result[strcspn(fstyp_result, "\n")] = '\0';
+	if (strcmp(fstyp_result, "ufs") == 0) {
+		n = snprintf(hdr->magic, CLOOP_MAGIC_LEN,
+		    "%s%s",
+		    handler->magic,
+		    "mount -r /dev/`mdconfig $0`.uzip $1;"
+		    "exit $?\n");
+	} else if (strcmp(fstyp_result, "cd9660") == 0) {
+		n = snprintf(hdr->magic, CLOOP_MAGIC_LEN,
+		    "%s%s",
+		    handler->magic,
+		    "mount_cd9660 /dev/`mdconfig $0`.uzip $1;"
+		    "exit $?\n");
+	} else if (strcmp(fstyp_result, "zfs") == 0) {
+		n = snprintf(hdr->magic, CLOOP_MAGIC_LEN,
+		    "%s%s",
+		    handler->magic,
+		    "mdconfig $0 && "
+		    "zpool import -o readonly=on $1;"
+		    "exit $?\n");
+	} else if (strcmp(fstyp_result, "msdosfs") == 0) {
+		n = snprintf(hdr->magic, CLOOP_MAGIC_LEN,
+		    "%s%s",
+		    handler->magic,
+		    "mount_msdosfs -r /dev/`mdconfig $0`.uzip $1;"
+		    "exit $?\n");
+	} else {
+		n = snprintf(hdr->magic, CLOOP_MAGIC_LEN,
+		    "%s%s",
+		    handler->magic,
+		    "echo 'must manually mount filesystem';"
+		    "exit $?\n");
+	}
+
+	fclose(fp);
+
+	return (n);
+}
+
 int main(int argc, char **argv)
 {
 	struct mkuz_cfg cfs;
@@ -229,8 +287,8 @@
 
 	cfs.handler = &uzip_fmts[comp_alg];
 
-	magiclen = strlcpy(hdr.magic, cfs.handler->magic, sizeof(hdr.magic));
-	assert(magiclen < sizeof(hdr.magic));
+	magiclen = build_header(&hdr, cfs.handler, argv[0]);
+	assert(magiclen > 0 && magiclen < sizeof(hdr.magic));
 
 	if (cfs.en_dedup != 0) {
 		/*