diff --git a/CMakeLists.txt b/CMakeLists.txt
index adede79d..7db7e5b6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -147,7 +147,7 @@ add_executable(shadps4
     src/emuTimer.h
     src/core/hle/libraries/libkernel/time_management.cpp
     src/core/hle/libraries/libkernel/time_management.h
-)
+ "src/common/io_file.cpp" "src/common/io_file.h")
 
 create_target_directory_groups(shadps4)
 
diff --git a/src/common/io_file.cpp b/src/common/io_file.cpp
new file mode 100644
index 00000000..86874c08
--- /dev/null
+++ b/src/common/io_file.cpp
@@ -0,0 +1,138 @@
+#include "io_file.h"
+
+//#include "helpers.hpp"
+
+#ifdef _MSC_VER
+// 64 bit offsets for MSVC
+#define fseeko _fseeki64
+#define ftello _ftelli64
+#define fileno _fileno
+
+#pragma warning(disable : 4996)
+#endif
+
+#ifndef _CRT_SECURE_NO_WARNINGS
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#ifdef WIN32
+#include <io.h> // For _chsize_s
+#else
+#include <unistd.h> // For ftruncate
+#endif
+
+IOFile::IOFile(const std::filesystem::path& path, const char* permissions) : handle(nullptr) {
+    open(path, permissions);
+}
+
+bool IOFile::open(const std::filesystem::path& path, const char* permissions) {
+    const auto str =
+        path.string(); // For some reason converting paths directly with c_str() doesn't work
+    return open(str.c_str(), permissions);
+}
+
+bool IOFile::open(const char* filename, const char* permissions) {
+    // If this IOFile is already bound to an open file descriptor, release the file descriptor
+    // To avoid leaking it and/or erroneously locking the file
+    if (isOpen()) {
+        close();
+    }
+
+    handle = std::fopen(filename, permissions);
+    return isOpen();
+}
+
+void IOFile::close() {
+    if (isOpen()) {
+        fclose(handle);
+        handle = nullptr;
+    }
+}
+
+std::pair<bool, std::size_t> IOFile::read(void* data, std::size_t length, std::size_t dataSize) {
+    if (!isOpen()) {
+        return {false, std::numeric_limits<std::size_t>::max()};
+    }
+
+    if (length == 0)
+        return {true, 0};
+    return {true, std::fread(data, dataSize, length, handle)};
+}
+
+std::pair<bool, std::size_t> IOFile::write(const void* data, std::size_t length,
+                                           std::size_t dataSize) {
+    if (!isOpen()) {
+        return {false, std::numeric_limits<std::size_t>::max()};
+    }
+
+    if (length == 0) {
+        return {true, 0};
+    } else {
+        return {true, std::fwrite(data, dataSize, length, handle)};
+    }
+}
+
+std::pair<bool, std::size_t> IOFile::readBytes(void* data, std::size_t count) {
+    return read(data, count, sizeof(std::uint8_t));
+}
+std::pair<bool, std::size_t> IOFile::writeBytes(const void* data, std::size_t count) {
+    return write(data, count, sizeof(std::uint8_t));
+}
+
+std::optional<std::uint64_t> IOFile::size() {
+    if (!isOpen())
+        return {};
+
+    std::uint64_t pos = ftello(handle);
+    if (fseeko(handle, 0, SEEK_END) != 0) {
+        return {};
+    }
+
+    std::uint64_t size = ftello(handle);
+    if ((size != pos) && (fseeko(handle, pos, SEEK_SET) != 0)) {
+        return {};
+    }
+
+    return size;
+}
+
+bool IOFile::seek(std::int64_t offset, int origin) {
+    if (!isOpen() || fseeko(handle, offset, origin) != 0)
+        return false;
+
+    return true;
+}
+
+bool IOFile::flush() {
+    if (!isOpen() || fflush(handle))
+        return false;
+
+    return true;
+}
+
+bool IOFile::rewind() {
+    return seek(0, SEEK_SET);
+}
+FILE* IOFile::getHandle() {
+    return handle;
+}
+
+void IOFile::setAppDataDir(const std::filesystem::path& dir) {
+    //if (dir == "")
+    //    Helpers::panic("Failed to set app data directory");
+    appData = dir;
+}
+
+bool IOFile::setSize(std::uint64_t size) {
+    if (!isOpen())
+        return false;
+    bool success;
+
+#ifdef WIN32
+    success = _chsize_s(_fileno(handle), size) == 0;
+#else
+    success = ftruncate(fileno(handle), size) == 0;
+#endif
+    fflush(handle);
+    return success;
+}
\ No newline at end of file
diff --git a/src/common/io_file.h b/src/common/io_file.h
new file mode 100644
index 00000000..85f7a78e
--- /dev/null
+++ b/src/common/io_file.h
@@ -0,0 +1,41 @@
+#pragma once
+#include <cstdint>
+#include <filesystem>
+#include <optional>
+
+class IOFile {
+    FILE* handle = nullptr;
+    static inline std::filesystem::path appData =""; // Directory for holding app data. AppData on Windows
+
+public:
+    IOFile() : handle(nullptr) {}
+    IOFile(FILE* handle) : handle(handle) {}
+    IOFile(const std::filesystem::path& path, const char* permissions = "rb");
+
+    bool isOpen() {
+        return handle != nullptr;
+    }
+    bool open(const std::filesystem::path& path, const char* permissions = "rb");
+    bool open(const char* filename, const char* permissions = "rb");
+    void close();
+
+    std::pair<bool, std::size_t> read(void* data, std::size_t length, std::size_t dataSize);
+    std::pair<bool, std::size_t> readBytes(void* data, std::size_t count);
+
+    std::pair<bool, std::size_t> write(const void* data, std::size_t length, std::size_t dataSize);
+    std::pair<bool, std::size_t> writeBytes(const void* data, std::size_t count);
+
+    std::optional<std::uint64_t> size();
+
+    bool seek(std::int64_t offset, int origin = SEEK_SET);
+    bool rewind();
+    bool flush();
+    FILE* getHandle();
+    static void setAppDataDir(const std::filesystem::path& dir);
+    static std::filesystem::path getAppData() {
+        return appData;
+    }
+
+    // Sets the size of the file to "size" and returns whether it succeeded or not
+    bool setSize(std::uint64_t size);
+};
\ No newline at end of file
diff --git a/src/core/file_sys/fs.h b/src/core/file_sys/fs.h
index 3255cc52..45bf718f 100644
--- a/src/core/file_sys/fs.h
+++ b/src/core/file_sys/fs.h
@@ -4,6 +4,7 @@
 #include <vector>
 
 #include "common/fs_file.h"
+#include <common/io_file.h>
 
 namespace Core::FileSys {
 
@@ -32,7 +33,7 @@ struct File {
     std::atomic_bool isDirectory;
     std::string m_host_name;
     std::string m_guest_name;
-    Common::FS::File f;
+    IOFile f;
     //std::vector<Common::FS::DirEntry> dirents;
     u32 dirents_index;
     std::mutex m_mutex;
diff --git a/src/core/hle/libraries/libkernel/file_system.cpp b/src/core/hle/libraries/libkernel/file_system.cpp
index 271cf363..57d08cae 100644
--- a/src/core/hle/libraries/libkernel/file_system.cpp
+++ b/src/core/hle/libraries/libkernel/file_system.cpp
@@ -2,6 +2,9 @@
 #include "common/debug.h"
 #include "core/hle/libraries/libkernel/file_system.h"
 #include "core/hle/libraries/libs.h"
+#include <core/file_sys/fs.h>
+#include <common/singleton.h>
+#include <core/hle/error_codes.h>
 
 namespace Core::Libraries::LibKernel {
 
@@ -9,10 +12,25 @@ constexpr bool log_file_fs = true;  // disable it to disable logging
 
 int PS4_SYSV_ABI sceKernelOpen(const char* path, int flags, u16 mode) {
     LOG_INFO_IF(log_file_fs, "sceKernelOpen path = {} flags = {:#x} mode = {:#x}\n", path, flags, mode);
-    return 0;
+    auto* h = Common::Singleton<Core::FileSys::HandleTable>::Instance();
+    auto* mnt = Common::Singleton<Core::FileSys::MntPoints>::Instance();
+
+    // only open files support!
+    u32 handle = h->createHandle();
+    auto* file = h->getFile(handle);
+    file->m_guest_name = path;
+    file->m_host_name = mnt->getHostFile(file->m_guest_name);
+
+    bool result = file->f.open(file->m_host_name);
+    if (!result) {
+        h->deleteHandle(handle);
+        return SCE_KERNEL_ERROR_EACCES;
+    }
+    file->isOpened = true;
+    return handle;
 }
 
-int PS4_SYSV_ABI open(const char* path, int flags, /* SceKernelMode*/ u16 mode) {
+int PS4_SYSV_ABI posix_open(const char* path, int flags, /* SceKernelMode*/ u16 mode) {
     LOG_INFO_IF(log_file_fs, "posix open redirect to sceKernelOpen\n");
     int result = sceKernelOpen(path, flags, mode);
     if (result < 0) {
@@ -21,9 +39,25 @@ int PS4_SYSV_ABI open(const char* path, int flags, /* SceKernelMode*/ u16 mode)
     return result;
 }
 
+size_t PS4_SYSV_ABI _readv(int d, const SceKernelIovec* iov, int iovcnt) {
+    auto* h = Common::Singleton<Core::FileSys::HandleTable>::Instance();
+    auto* file = h->getFile(d);
+    size_t total_read = 0;
+    file->m_mutex.lock();
+    for (int i = 0; i < iovcnt; i++) {
+        total_read += file->f.readBytes(iov[i].iov_base,iov[i].iov_len).second;
+    }
+    file->m_mutex.unlock();
+    return total_read;
+}
+
 void fileSystemSymbolsRegister(Loader::SymbolsResolver* sym) {
     LIB_FUNCTION("1G3lF1Gg1k8", "libkernel", 1, "libkernel", 1, 1, sceKernelOpen);
-    LIB_FUNCTION("wuCroIGjt2g", "libScePosix", 1, "libkernel", 1, 1, open);
+    LIB_FUNCTION("wuCroIGjt2g", "libScePosix", 1, "libkernel", 1, 1, posix_open);
+    LIB_FUNCTION("+WRlkKjZvag", "libkernel", 1, "libkernel", 1, 1, _readv);
+
+    // openOrbis (to check if it is valid out of OpenOrbis
+    LIB_FUNCTION("6c3rCVE-fTU", "libkernel", 1, "libkernel", 1, 1, posix_open);  // _open shoudld be equal to open function
 }
 
 } // namespace Core::Libraries::LibKernel
diff --git a/src/core/hle/libraries/libkernel/file_system.h b/src/core/hle/libraries/libkernel/file_system.h
index f5be1d1e..8a3ef3bb 100644
--- a/src/core/hle/libraries/libkernel/file_system.h
+++ b/src/core/hle/libraries/libkernel/file_system.h
@@ -8,9 +8,14 @@ class SymbolsResolver;
 
 namespace Core::Libraries::LibKernel {
 
+struct SceKernelIovec {
+    void *iov_base;
+    size_t iov_len;
+};
+
 int PS4_SYSV_ABI sceKernelOpen(const char *path, int flags, /* SceKernelMode*/ u16 mode);
 
-int PS4_SYSV_ABI open(const char *path, int flags, /* SceKernelMode*/ u16 mode);
+int PS4_SYSV_ABI posix_open(const char *path, int flags, /* SceKernelMode*/ u16 mode);
 
 void fileSystemSymbolsRegister(Loader::SymbolsResolver *sym);