diff --git a/src/Filesystem/dir.c b/src/Filesystem/dir.c
new file mode 100644
index 0000000..840a3f3
--- /dev/null
+++ b/src/Filesystem/dir.c
@@ -0,0 +1 @@
+#include "dir.h"
\ No newline at end of file
diff --git a/src/Filesystem/dir.h b/src/Filesystem/dir.h
new file mode 100644
index 0000000..111e4ca
--- /dev/null
+++ b/src/Filesystem/dir.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#if __cplusplus
+extern "C" {
+#endif
+
+#include "../base/base.h"
+#include "file.h"
+
+typedef char* DirPath;
+Array_declare(DirPath);
+
+Array_FilePath dir_getFiles(DirPath path);
+Array_FilePath dir_findFiles(DirPath path, FilePath searchPattern);
+
+#if __cplusplus
+}
+#endif
\ No newline at end of file
diff --git a/src/Filesystem/file.c b/src/Filesystem/file.c
new file mode 100644
index 0000000..08e53fb
--- /dev/null
+++ b/src/Filesystem/file.c
@@ -0,0 +1,108 @@
+#include "file.h"
+#include "../String/StringBuilder.h"
+
+ktid_define(File);
+
+char* FileOpenMode_toStr(FileOpenMode m){
+    char* p;
+    switch(m){
+        case FileOpenMode_Read: p="rb"; break;
+        case FileOpenMode_Write: p="wb"; break;
+        case FileOpenMode_Append: p="ab"; break;
+        case FileOpenMode_ReadWrite: p="wb+"; break;
+        case FileOpenMode_ReadAppend: p="ab+"; break;
+        default:
+            dbg(m);
+            throw(ERR_UNEXPECTEDVAL);
+    }
+    return p;
+}
+
+Maybe file_open(FilePath path, FileOpenMode mode){
+    File* file=fopen(path, FileOpenMode_toStr(mode));
+    if(!file)
+        safethrow(cptr_concat("can't open file ", (char*)path),;);
+    return SUCCESS(UniHeapPtr(File,file));
+}
+
+Maybe file_close(File* file){
+    if(!file)
+        safethrow(ERR_NULLPTR,;);
+    if(fclose(file))
+        safethrow(ERR_IO,;);
+    return MaybeNull;
+}
+
+#define ioWriteCheck()\
+    if(rezult==EOF)\
+        safethrow(ERR_IO_EOF,;);\
+    if(rezult!=0)\
+        safethrow(ERR_IO,;);
+
+Maybe file_writeChar(File* file, char byte){
+    int rezult=fputc(byte, file);
+    ioWriteCheck();
+    return MaybeNull;
+}
+
+Maybe file_writeBuffer(File* file, char* buffer, uint64 length){
+    int rezult=0;
+    for(uint64 i=0; i<length && !rezult; i++)
+        rezult=fputc(buffer[i], file);
+    ioWriteCheck();
+    return MaybeNull;
+}
+
+Maybe file_writeCptr(File* file, char* cptr){
+    int rezult=fputs(cptr, file);
+    ioWriteCheck();
+    return MaybeNull;
+}
+
+
+Maybe file_readChar(File* file){
+    int rezult=fgetc(file);
+    if(feof(file)) safethrow(ERR_IO_EOF,;);
+    if(ferror(file)) safethrow(ERR_IO,;);
+    return SUCCESS(UniUInt64(rezult));
+}
+
+Maybe file_readBuffer(File* file, char* buffer, uint64 length){
+    int rezult=0;
+    uint64 i=0;
+    for(; i<length && rezult!=EOF; i++){
+        rezult=fgetc(file);
+        buffer[i]=(char)rezult;
+    }
+    if(ferror(file)) safethrow(ERR_IO,;);
+    return SUCCESS(UniUInt64(i));
+}
+
+Maybe file_readAll(File* file, char** allBytes){
+    int rezult=0;
+    char buffer[256];
+    string bufStr={.ptr=buffer, .length=sizeof(buffer)};
+    StringBuilder* sb=StringBuilder_create();
+    uint64 i=0;
+    while(true){
+        rezult=fgetc(file);
+        if(rezult!=EOF){
+            if(ferror(file)) 
+                safethrow(ERR_IO,; StringBuilder_free(sb));
+            break;
+        }
+        buffer[i]=(char)rezult;
+        i++;
+        if(!(i%sizeof(buffer)))
+            StringBuilder_append_string(sb,bufStr);
+    }
+    bufStr.length=i%sizeof(buffer);
+    if(bufStr.length!=0)
+        StringBuilder_append_string(sb,bufStr);
+    string str=StringBuilder_build(sb);
+    *allBytes=str.ptr;
+    // i dont know how can it happen, but if it will have, it will be very dangerous
+    if(i!=str.length) 
+        throw(ERR_UNEXPECTEDVAL);
+    return SUCCESS(UniUInt64(i));
+}
diff --git a/src/Filesystem/file.h b/src/Filesystem/file.h
new file mode 100644
index 0000000..1f0f045
--- /dev/null
+++ b/src/Filesystem/file.h
@@ -0,0 +1,74 @@
+#pragma once
+
+#if __cplusplus
+extern "C" {
+#endif
+
+#include "../base/base.h"
+#include "../Array/Array.h"
+#include "../String/string.h"
+
+typedef char* FilePath;
+Array_declare(FilePath);
+typedef FILE File;
+ktid_declare(File);
+
+typedef enum FileOpenMode{
+    // open a file for reading 
+    FileOpenMode_Read=1, 
+    // (re)create a file for writing
+    FileOpenMode_Write=2, 
+    // opens file for writing additional data to the end / creates new file 
+    FileOpenMode_Append=4,
+    // (re)creates file for reading/writing
+    FileOpenMode_ReadWrite=FileOpenMode_Read|FileOpenMode_Write, 
+    // opens file for readng/writing additional data to the end / creates new file 
+    FileOpenMode_ReadAppend=FileOpenMode_Read|FileOpenMode_Append
+} FileOpenMode;
+
+
+/// @brief opens file
+/// @param path path to file
+/// @param mode Read/Write/Append/ReadWrite/ReadAppend
+/// @return Maybe<File*>
+Maybe file_open(FilePath path, FileOpenMode mode);
+
+/// @brief closes file descriptor
+/// @return Maybe<void>
+Maybe file_close(File* file);
+
+/// @brief closes file descriptor
+/// @param byte byte to write
+/// @return Maybe<void>
+Maybe file_writeChar(File* file, char byte);
+
+/// @brief closes file descriptor
+/// @param buffer bytes to write
+/// @param length buffer length
+/// @return Maybe<void>
+Maybe file_writeBuffer(File* file, char* buffer, uint64 length);
+
+/// @brief writes all cstring array content to file
+/// @param cptr zero-terminated cstring
+/// @return Maybe<void>
+Maybe file_writeCptr(File* file, char* cptr);
+
+
+/// @brief reads single byte from file
+/// @return Maybe<char>
+Maybe file_readChar(File* file);
+
+/// @brief reads byte array of specofied length
+/// @param buffer buffer that will be filled with file bytes
+/// @param length buffer length
+/// @return Maybe<uint64> total number of successfully read bytes (<=length)
+Maybe file_readBuffer(File* file, char* buffer, uint64 length);
+
+/// @brief reads all bytes from file
+/// @param allBytes ptr to the file's content will be pushed there 
+/// @return Maybe<uint64> total number of successfully read bytes
+Maybe file_readAll(File* file, char** allBytes);
+
+#if __cplusplus
+}
+#endif
\ No newline at end of file
diff --git a/src/Filesystem/filesystem.h b/src/Filesystem/filesystem.h
index 2bdd4cb..9e68038 100644
--- a/src/Filesystem/filesystem.h
+++ b/src/Filesystem/filesystem.h
@@ -1,22 +1,3 @@
-#pragma once
-
-#if __cplusplus
-extern "C" {
-#endif
-
-#include "std.h"
-
-#if defined(_WIN32) || defined (_WIN64)
-static const char path_sep='\\';
-#else
-static const char path_sep='/';
-#endif
-
-char* __path_concat(uint16 n, char* path_start, ...);
-#define path_concat(PATH_PARTS) __path_concat(count_args(PATH_PARTS), PATH_PARTS)
-
-
-
-#if __cplusplus
-}
-#endif
\ No newline at end of file
+#include "path.h"
+#include "dir.h"
+#include "file.h"
diff --git a/src/Filesystem/filesystem.c b/src/Filesystem/path.c
similarity index 95%
rename from src/Filesystem/filesystem.c
rename to src/Filesystem/path.c
index fe535da..6b52991 100644
--- a/src/Filesystem/filesystem.c
+++ b/src/Filesystem/path.c
@@ -36,3 +36,7 @@ char* __path_concat(uint16 n, char* prev_part, ...){
     free(lengths);
     return output;
 }
+
+char* path_fixSeparators(char* path){
+    
+}
\ No newline at end of file
diff --git a/src/Filesystem/path.h b/src/Filesystem/path.h
new file mode 100644
index 0000000..1b9ec52
--- /dev/null
+++ b/src/Filesystem/path.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#if __cplusplus
+extern "C" {
+#endif
+
+#include "../base/base.h"
+
+#if defined(_WIN32) || defined (_WIN64)
+static const char path_sep='\\';
+#else
+static const char path_sep='/';
+#endif
+
+char* __path_concat(uint16 n, char* path_start, ...);
+#define path_concat(PATH_PARTS) __path_concat(count_args(PATH_PARTS), PATH_PARTS)
+
+#if __cplusplus
+}
+#endif
\ No newline at end of file