diff --git a/source/commandline.cpp b/source/commandline.cpp
index 7680dc0..6d2c470 100644
--- a/source/commandline.cpp
+++ b/source/commandline.cpp
@@ -42,12 +42,22 @@ void cmd_print_info(const char* command) {
         printf("  -i/--image: PNG file to use as the banner image.\n");
         printf("  -a/--audio: WAV file to use as the banner's tune.\n");
         printf("  -o/--output: File to output the created banner to.\n");
+    } else if(strcmp(command, "makecwav") == 0) {
+        printf("makecwav - Creates a CWAV file from a WAV.\n");
+        printf("  -i/--input: WAV file to convert.\n");
+        printf("  -o/--output: File to output the created CWAV to.\n");
+    } else if(strcmp(command, "lz11") == 0) {
+        printf("lz11 - Compresses a file with LZ11.\n");
+        printf("  -i/--input: File to compress.\n");
+        printf("  -o/--output: File to output the compressed data to.\n");
     }
 }
 
 void cmd_print_commands() {
     printf("Available commands:\n");
     cmd_print_info("makebanner");
+    cmd_print_info("makecwav");
+    cmd_print_info("lz11");
 }
 
 void cmd_missing_args(const char* command) {
diff --git a/source/main.cpp b/source/main.cpp
index 3bce946..a55a5fc 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -63,17 +63,77 @@ int make_banner(const char* image, const char* audio, const char* output) {
 
     FILE* fd = fopen(output, "wb");
     if(!fd) {
-        printf("ERROR: Could not open output file.\n");
+        printf("ERROR: Could not open output file: %s\n", strerror(errno));
         return 3;
     }
 
     fwrite(bnr, 1, bnrSize, fd);
     fclose(fd);
+
     free(bnr);
+
     printf("Created banner \"%s\".\n", output);
     return 0;
 }
 
+int make_cwav(char* input, char* output) {
+    u32 cwavSize = 0;
+    u8* cwav = convert_to_cwav(input, &cwavSize);
+    if(!cwav) {
+        return 1;
+    }
+
+    FILE* fd = fopen(output, "wb");
+    if(!fd) {
+        printf("ERROR: Could not open output file: %s\n", strerror(errno));
+        return 2;
+    }
+
+    fwrite(cwav, 1, cwavSize, fd);
+    fclose(fd);
+
+    free(cwav);
+
+    printf("Created CWAV \"%s\".\n", output);
+    return 0;
+}
+
+int lz11(char* input, char* output) {
+    FILE* in = fopen(input, "r");
+    if(!in) {
+        printf("ERROR: Could not open input file: %s\n", strerror(errno));
+        return 1;
+    }
+
+    fseek(in, 0, SEEK_END);
+    u32 size = (u32) ftell(in);
+    fseek(in, 0, SEEK_SET);
+
+    u8 data[size];
+    fread(data, 1, size, in);
+    fclose(in);
+
+    u32 compressedSize;
+    u8* compressed = lz11_compress(data, size, &compressedSize);
+    if(!compressed) {
+        return 2;
+    }
+
+    FILE* fd = fopen(output, "wb");
+    if(!fd) {
+        printf("ERROR: Could not open output file: %s\n", strerror(errno));
+        return 3;
+    }
+
+    fwrite(compressed, 1, compressedSize, fd);
+    fclose(fd);
+
+    free(compressed);
+
+    printf("Compressed to file \"%s\".\n", output);
+    return 0;
+}
+
 int main(int argc, char* argv[]) {
     if(argc < 2) {
         cmd_print_usage(argv[0]);
@@ -92,6 +152,24 @@ int main(int argc, char* argv[]) {
         }
 
         return make_banner(banner, audio, output);
+    } else if(strcmp(command, "makecwav") == 0) {
+        char* input = cmd_find_arg(args, "i", "input");
+        char* output = cmd_find_arg(args, "o", "output");
+        if(!input || !output) {
+            cmd_missing_args(command);
+            return -1;
+        }
+
+        return make_cwav(input, output);
+    } else if(strcmp(command, "lz11") == 0) {
+        char* input = cmd_find_arg(args, "i", "input");
+        char* output = cmd_find_arg(args, "o", "output");
+        if(!input || !output) {
+            cmd_missing_args(command);
+            return -1;
+        }
+
+        return lz11(input, output);
     } else {
         cmd_invalid_command(command);
         return -1;
diff --git a/source/wav.cpp b/source/wav.cpp
index 631518d..d3852fc 100644
--- a/source/wav.cpp
+++ b/source/wav.cpp
@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
 
 bool find_chunk(FILE* fd, const char* magic) {
     char curr[5] = {0};
@@ -20,7 +21,7 @@ bool find_chunk(FILE* fd, const char* magic) {
 WAV* read_wav(const char* file) {
     FILE* fd = fopen(file, "r");
     if(!fd) {
-        printf("ERROR: Could not open WAV file.\n");
+        printf("ERROR: Could not open WAV file: %s\n", strerror(errno));
         return NULL;
     }