diff --git a/src/coding/coding.h b/src/coding/coding.h
index 79b3b816..aa9d0827 100644
--- a/src/coding/coding.h
+++ b/src/coding/coding.h
@@ -354,6 +354,6 @@ int w_bits(vgm_bitstream * ob, int num_bits, uint32_t value);
 
 
 /* helper to pass a wrapped, clamped, fake extension-ed, SF to another meta */
-STREAMFILE* setup_subfile_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, char* extension);
+STREAMFILE* setup_subfile_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* extension);
 
 #endif /*_CODING_H*/
diff --git a/src/coding/coding_utils.c b/src/coding/coding_utils.c
index b63e65d6..158c5e4e 100644
--- a/src/coding/coding_utils.c
+++ b/src/coding/coding_utils.c
@@ -1085,7 +1085,7 @@ int w_bits(vgm_bitstream * ob, int num_bits, uint32_t value) {
 /* CUSTOM STREAMFILES                           */
 /* ******************************************** */
 
-STREAMFILE* setup_subfile_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, char* extension) {
+STREAMFILE* setup_subfile_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* extension) {
     STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
 
     new_streamFile = open_wrap_streamfile(streamFile);
diff --git a/src/meta/aax.c b/src/meta/aax.c
index 1ad4dbaa..3418620e 100644
--- a/src/meta/aax.c
+++ b/src/meta/aax.c
@@ -3,8 +3,6 @@
 #include "../coding/coding.h"
 #include "aax_utf.h"
 
-static STREAMFILE* setup_aax_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext);
-
 
 #define MAX_SEGMENTS 2 /* usually segment0=intro, segment1=loop/main */
 
@@ -77,7 +75,7 @@ VGMSTREAM * init_vgmstream_aax(STREAMFILE *streamFile) {
 
     /* open each segment subfile */
     for (i = 0; i < segment_count; i++) {
-        STREAMFILE* temp_streamFile = setup_aax_streamfile(streamFile, segment_offset[i],segment_size[i], (is_hca ? "hca" : "adx"));
+        STREAMFILE* temp_streamFile = setup_subfile_streamfile(streamFile, segment_offset[i],segment_size[i], (is_hca ? "hca" : "adx"));
         if (!temp_streamFile) goto fail;
 
         data->segments[i] = is_hca ?
@@ -138,29 +136,6 @@ fail:
     return NULL;
 }
 
-static STREAMFILE* setup_aax_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext) {
-    STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
-
-    /* setup subfile */
-    new_streamFile = open_wrap_streamfile(streamFile);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_fakename_streamfile(temp_streamFile, NULL,fake_ext);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    return temp_streamFile;
-
-fail:
-    close_streamfile(temp_streamFile);
-    return NULL;
-}
-
 
 /* CRI's UTF wrapper around DSP [Sonic Colors sfx (Wii), NiGHTS: Journey of Dreams sfx (Wii)] */
 VGMSTREAM * init_vgmstream_utf_dsp(STREAMFILE *streamFile) {
diff --git a/src/meta/atsl.c b/src/meta/atsl.c
index 7ec19024..b469c2da 100644
--- a/src/meta/atsl.c
+++ b/src/meta/atsl.c
@@ -1,7 +1,6 @@
 #include "meta.h"
 #include "../coding/coding.h"
 
-static STREAMFILE* setup_atsl_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext);
 typedef enum { ATRAC3, ATRAC9, KOVS, KTSS } atsl_codec;
 
 /* .ATSL - Koei Tecmo audio container [One Piece Pirate Warriors (PS3), Warriors All-Stars (PC)] */
@@ -110,7 +109,7 @@ VGMSTREAM * init_vgmstream_atsl(STREAMFILE *streamFile) {
     /* some kind of seek/switch table may follow (optional, found in .atsl3) */
 
 
-    temp_streamFile = setup_atsl_streamfile(streamFile, subfile_offset,subfile_size, fake_ext);
+    temp_streamFile = setup_subfile_streamfile(streamFile, subfile_offset,subfile_size, fake_ext);
     if (!temp_streamFile) goto fail;
 
     /* init the VGMSTREAM */
@@ -144,27 +143,3 @@ fail:
     close_vgmstream(vgmstream);
     return NULL;
 }
-
-
-static STREAMFILE* setup_atsl_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext) {
-    STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
-
-    /* setup subfile */
-    new_streamFile = open_wrap_streamfile(streamFile);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_fakename_streamfile(temp_streamFile, NULL,fake_ext);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    return temp_streamFile;
-
-fail:
-    close_streamfile(temp_streamFile);
-    return NULL;
-}
diff --git a/src/meta/nus3bank.c b/src/meta/nus3bank.c
index f47919ae..48b749d7 100644
--- a/src/meta/nus3bank.c
+++ b/src/meta/nus3bank.c
@@ -1,7 +1,6 @@
 #include "meta.h"
 #include "../coding/coding.h"
 
-static STREAMFILE* setup_nus3bank_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext);
 typedef enum { /*XMA_RAW, ATRAC3,*/ IDSP, ATRAC9, OPUS, BNSF, /*PCM, XMA_RIFF*/ } nus3bank_codec;
 
 /* .nus3bank - Namco's newest audio container [Super Smash Bros (Wii U), idolmaster (PS4))] */
@@ -144,7 +143,7 @@ VGMSTREAM * init_vgmstream_nus3bank(STREAMFILE *streamFile) {
 
     //;VGM_LOG("NUS3BANK: subfile=%lx, size=%x\n", subfile_offset, subfile_size);
 
-    temp_streamFile = setup_nus3bank_streamfile(streamFile, subfile_offset,subfile_size, fake_ext);
+    temp_streamFile = setup_subfile_streamfile(streamFile, subfile_offset,subfile_size, fake_ext);
     if (!temp_streamFile) goto fail;
 
     /* init the VGMSTREAM */
@@ -182,27 +181,3 @@ fail:
     close_vgmstream(vgmstream);
     return NULL;
 }
-
-
-static STREAMFILE* setup_nus3bank_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext) {
-    STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
-
-    /* setup subfile */
-    new_streamFile = open_wrap_streamfile(streamFile);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_fakename_streamfile(temp_streamFile, NULL,fake_ext);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    return temp_streamFile;
-
-fail:
-    close_streamfile(temp_streamFile);
-    return NULL;
-}
diff --git a/src/meta/opus_ppp.c b/src/meta/opus_ppp.c
index 2adc0c4e..0ff9a26a 100644
--- a/src/meta/opus_ppp.c
+++ b/src/meta/opus_ppp.c
@@ -2,8 +2,6 @@
 #include "../coding/coding.h"
 #include "../layout/layout.h"
 
-static STREAMFILE* setup_opus_ppp_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext);
-
 /* Nippon Ichi SPS wrapper (segmented)  [Penny-Punching Princess (Switch)] */
 VGMSTREAM * init_vgmstream_opus_sps_n1_segmented(STREAMFILE *streamFile) {
     VGMSTREAM * vgmstream = NULL;
@@ -43,7 +41,7 @@ VGMSTREAM * init_vgmstream_opus_sps_n1_segmented(STREAMFILE *streamFile) {
         if (!segment_size)
             goto fail;
 
-        temp_streamFile = setup_opus_ppp_streamfile(streamFile, segment_offset,segment_size, "opus");
+        temp_streamFile = setup_subfile_streamfile(streamFile, segment_offset,segment_size, "opus");
         if (!temp_streamFile) goto fail;
 
         data->segments[i] = init_vgmstream_opus_std(temp_streamFile);
@@ -93,26 +91,3 @@ fail:
     free_layout_segmented(data);
     return NULL;
 }
-
-static STREAMFILE* setup_opus_ppp_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext) {
-    STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
-
-    /* setup subfile */
-    new_streamFile = open_wrap_streamfile(streamFile);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_fakename_streamfile(temp_streamFile, NULL,fake_ext);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    return temp_streamFile;
-
-fail:
-    close_streamfile(temp_streamFile);
-    return NULL;
-}
diff --git a/src/meta/ps2_ads.c b/src/meta/ps2_ads.c
index 4b280dd5..b72fb885 100644
--- a/src/meta/ps2_ads.c
+++ b/src/meta/ps2_ads.c
@@ -313,8 +313,6 @@ fail:
 
 /* ****************************************************************************** */
 
-static STREAMFILE* setup_subfile_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext);
-
 /* ADS in containers */
 VGMSTREAM * init_vgmstream_ps2_ads_container(STREAMFILE *streamFile) {
     VGMSTREAM *vgmstream = NULL;
@@ -356,28 +354,3 @@ fail:
     close_vgmstream(vgmstream);
     return NULL;
 }
-
-static STREAMFILE* setup_subfile_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext) {
-    STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
-
-    /* setup subfile */
-    new_streamFile = open_wrap_streamfile(streamFile);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    if (fake_ext) {
-        new_streamFile = open_fakename_streamfile(temp_streamFile, NULL,fake_ext);
-        if (!new_streamFile) goto fail;
-        temp_streamFile = new_streamFile;
-    }
-
-    return temp_streamFile;
-
-fail:
-    close_streamfile(temp_streamFile);
-    return NULL;
-}
diff --git a/src/meta/sps_n1.c b/src/meta/sps_n1.c
index f6857797..d75101ba 100644
--- a/src/meta/sps_n1.c
+++ b/src/meta/sps_n1.c
@@ -1,8 +1,6 @@
 #include "meta.h"
 #include "../coding/coding.h"
 
-static STREAMFILE* setup_sps_streamfile(STREAMFILE *streamfile, off_t subfile_offset, size_t subfile_size, char* extension);
-
 /* .SPS - Nippon Ichi wrapper [ClaDun (PSP)] */
 VGMSTREAM * init_vgmstream_sps_n1(STREAMFILE *streamFile) {
     VGMSTREAM *vgmstream = NULL;
@@ -26,7 +24,7 @@ VGMSTREAM * init_vgmstream_sps_n1(STREAMFILE *streamFile) {
     /* init the VGMSTREAM */
     switch(type) {
         case 1: /* .vag */
-            temp_streamFile = setup_sps_streamfile(streamFile, subfile_offset, subfile_size, "vag");
+            temp_streamFile = setup_subfile_streamfile(streamFile, subfile_offset, subfile_size, "vag");
             if (!temp_streamFile) goto fail;
 
             vgmstream = init_vgmstream_vag(temp_streamFile);
@@ -34,7 +32,7 @@ VGMSTREAM * init_vgmstream_sps_n1(STREAMFILE *streamFile) {
             break;
 
         case 2: /* .at3 */
-            temp_streamFile = setup_sps_streamfile(streamFile, subfile_offset, subfile_size, "at3");
+            temp_streamFile = setup_subfile_streamfile(streamFile, subfile_offset, subfile_size, "at3");
             if (!temp_streamFile) goto fail;
 
             vgmstream = init_vgmstream_riff(temp_streamFile);
@@ -54,26 +52,3 @@ fail:
     close_vgmstream(vgmstream);
     return NULL;
 }
-
-static STREAMFILE* setup_sps_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, char* extension) {
-    STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
-
-    /* setup subfile */
-    new_streamFile = open_wrap_streamfile(streamFile);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_fakename_streamfile(temp_streamFile, NULL,extension);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    return temp_streamFile;
-
-fail:
-    close_streamfile(temp_streamFile);
-    return NULL;
-}
diff --git a/src/meta/ubi_jade.c b/src/meta/ubi_jade.c
index a3b48435..054c8714 100644
--- a/src/meta/ubi_jade.c
+++ b/src/meta/ubi_jade.c
@@ -1,7 +1,6 @@
 #include "meta.h"
 #include "../coding/coding.h"
 
-static STREAMFILE* setup_jade_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext);
 static int get_loop_points(STREAMFILE *streamFile, int *out_loop_start, int *out_loop_end);
 
 /* Jade RIFF - from Ubisoft Jade engine games [Beyond Good & Evil (multi), Rayman Raving Rabbids 1/2 (multi)] */
@@ -231,7 +230,7 @@ VGMSTREAM * init_vgmstream_ubi_jade(STREAMFILE *streamFile) {
             if (read_32bitBE(start_offset, streamFile) != 0x4D534643) /* "MSF\43" */
                 goto fail;
 
-            temp_streamFile = setup_jade_streamfile(streamFile, start_offset, data_size, "msf");
+            temp_streamFile = setup_subfile_streamfile(streamFile, start_offset, data_size, "msf");
             if (!temp_streamFile) goto fail;
 
             temp_vgmstream = init_vgmstream_ps3_msf(temp_streamFile);
@@ -362,7 +361,7 @@ VGMSTREAM * init_vgmstream_ubi_jade_container(STREAMFILE *streamFile) {
 
     subfile_size = read_32bitLE(subfile_offset+0x04,streamFile) + 0x04+0x04;
 
-    temp_streamFile = setup_jade_streamfile(streamFile, subfile_offset,subfile_size, NULL);
+    temp_streamFile = setup_subfile_streamfile(streamFile, subfile_offset,subfile_size, NULL);
     if (!temp_streamFile) goto fail;
 
     if (check_extensions(streamFile,"xma")) {
@@ -379,28 +378,3 @@ fail:
     close_vgmstream(vgmstream);
     return NULL;
 }
-
-static STREAMFILE* setup_jade_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext) {
-    STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
-
-    /* setup subfile */
-    new_streamFile = open_wrap_streamfile(streamFile);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    if (fake_ext) {
-        new_streamFile = open_fakename_streamfile(temp_streamFile, NULL,fake_ext);
-        if (!new_streamFile) goto fail;
-        temp_streamFile = new_streamFile;
-    }
-
-    return temp_streamFile;
-
-fail:
-    close_streamfile(temp_streamFile);
-    return NULL;
-}
diff --git a/src/meta/xwb.c b/src/meta/xwb.c
index d7cf3340..339a03e1 100644
--- a/src/meta/xwb.c
+++ b/src/meta/xwb.c
@@ -72,7 +72,6 @@ typedef struct {
 } xwb_header;
 
 static void get_name(char * buf, size_t maxsize, int target_subsong, xwb_header * xwb, STREAMFILE *streamFile);
-static STREAMFILE* setup_subfile_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext);
 
 
 /* XWB - XACT Wave Bank (Microsoft SDK format for XBOX/XBOX360/Windows) */
@@ -600,31 +599,6 @@ fail:
 
 /* ****************************************************************************** */
 
-static STREAMFILE* setup_subfile_streamfile(STREAMFILE *streamFile, off_t subfile_offset, size_t subfile_size, const char* fake_ext) {
-    STREAMFILE *temp_streamFile = NULL, *new_streamFile = NULL;
-
-    /* setup subfile */
-    new_streamFile = open_wrap_streamfile(streamFile);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_clamp_streamfile(temp_streamFile, subfile_offset,subfile_size);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    new_streamFile = open_fakename_streamfile(temp_streamFile, NULL,fake_ext);
-    if (!new_streamFile) goto fail;
-    temp_streamFile = new_streamFile;
-
-    return temp_streamFile;
-
-fail:
-    close_streamfile(temp_streamFile);
-    return NULL;
-}
-
-/* ****************************************************************************** */
-
 /* try to get the stream name in the .xwb, though they are very rarely included */
 static int get_xwb_name(char * buf, size_t maxsize, int target_subsong, xwb_header * xwb, STREAMFILE *streamFile) {
     size_t read;