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diff --git a/v_windows/v/vlib/rand/rand.v b/v_windows/v/vlib/rand/rand.v
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+++ b/v_windows/v/vlib/rand/rand.v
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+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module rand
+
+import rand.config
+import rand.wyrand
+
+// PRNG is a common interface for all PRNGs that can be used seamlessly with the rand
+// modules's API. It defines all the methods that a PRNG (in the vlib or custom made) must
+// implement in order to ensure that _all_ functions can be used with the generator.
+pub interface PRNG {
+	seed(seed_data []u32)
+	u32() u32
+	u64() u64
+	u32n(max u32) u32
+	u64n(max u64) u64
+	u32_in_range(min u32, max u32) u32
+	u64_in_range(min u64, max u64) u64
+	int() int
+	i64() i64
+	int31() int
+	int63() i64
+	intn(max int) int
+	i64n(max i64) i64
+	int_in_range(min int, max int) int
+	i64_in_range(min i64, max i64) i64
+	f32() f32
+	f64() f64
+	f32n(max f32) f32
+	f64n(max f64) f64
+	f32_in_range(min f32, max f32) f32
+	f64_in_range(min f64, max f64) f64
+}
+
+__global (
+	default_rng &PRNG
+)
+
+// init initializes the default RNG.
+fn init() {
+	default_rng = new_default()
+}
+
+// new_default returns a new instance of the default RNG. If the seed is not provided, the current time will be used to seed the instance.
+pub fn new_default(config config.PRNGConfigStruct) &PRNG {
+	mut rng := &wyrand.WyRandRNG{}
+	rng.seed(config.seed_)
+	return rng
+}
+
+// get_current_rng returns the PRNG instance currently in use. If it is not changed, it will be an instance of wyrand.WyRandRNG.
+pub fn get_current_rng() &PRNG {
+	return default_rng
+}
+
+// set_rng changes the default RNG from wyrand.WyRandRNG (or whatever the last RNG was) to the one
+// provided by the user. Note that this new RNG must be seeded manually with a constant seed or the
+// `seed.time_seed_array()` method. Also, it is recommended to store the old RNG in a variable and
+// should be restored if work with the custom RNG is complete. It is not necessary to restore if the
+// program terminates soon afterwards.
+pub fn set_rng(rng &PRNG) {
+	default_rng = unsafe { rng }
+}
+
+// seed sets the given array of `u32` values as the seed for the `default_rng`. The default_rng is
+// an instance of WyRandRNG which takes 2 u32 values. When using a custom RNG, make sure to use
+// the correct number of u32s.
+pub fn seed(seed []u32) {
+	default_rng.seed(seed)
+}
+
+// u32 returns a uniformly distributed `u32` in range `[0, 2³²)`.
+pub fn u32() u32 {
+	return default_rng.u32()
+}
+
+// u64 returns a uniformly distributed `u64` in range `[0, 2⁶⁴)`.
+pub fn u64() u64 {
+	return default_rng.u64()
+}
+
+// u32n returns a uniformly distributed pseudorandom 32-bit signed positive `u32` in range `[0, max)`.
+pub fn u32n(max u32) u32 {
+	return default_rng.u32n(max)
+}
+
+// u64n returns a uniformly distributed pseudorandom 64-bit signed positive `u64` in range `[0, max)`.
+pub fn u64n(max u64) u64 {
+	return default_rng.u64n(max)
+}
+
+// u32_in_range returns a uniformly distributed pseudorandom 32-bit unsigned `u32` in range `[min, max)`.
+pub fn u32_in_range(min u32, max u32) u32 {
+	return default_rng.u32_in_range(min, max)
+}
+
+// u64_in_range returns a uniformly distributed pseudorandom 64-bit unsigned `u64` in range `[min, max)`.
+pub fn u64_in_range(min u64, max u64) u64 {
+	return default_rng.u64_in_range(min, max)
+}
+
+// int returns a uniformly distributed pseudorandom 32-bit signed (possibly negative) `int`.
+pub fn int() int {
+	return default_rng.int()
+}
+
+// intn returns a uniformly distributed pseudorandom 32-bit signed positive `int` in range `[0, max)`.
+pub fn intn(max int) int {
+	return default_rng.intn(max)
+}
+
+// byte returns a uniformly distributed pseudorandom 8-bit unsigned positive `byte`.
+pub fn byte() byte {
+	return byte(default_rng.u32() & 0xff)
+}
+
+// int_in_range returns a uniformly distributed pseudorandom  32-bit signed int in range `[min, max)`.
+// Both `min` and `max` can be negative, but we must have `min < max`.
+pub fn int_in_range(min int, max int) int {
+	return default_rng.int_in_range(min, max)
+}
+
+// int31 returns a uniformly distributed pseudorandom 31-bit signed positive `int`.
+pub fn int31() int {
+	return default_rng.int31()
+}
+
+// i64 returns a uniformly distributed pseudorandom 64-bit signed (possibly negative) `i64`.
+pub fn i64() i64 {
+	return default_rng.i64()
+}
+
+// i64n returns a uniformly distributed pseudorandom 64-bit signed positive `i64` in range `[0, max)`.
+pub fn i64n(max i64) i64 {
+	return default_rng.i64n(max)
+}
+
+// i64_in_range returns a uniformly distributed pseudorandom 64-bit signed `i64` in range `[min, max)`.
+pub fn i64_in_range(min i64, max i64) i64 {
+	return default_rng.i64_in_range(min, max)
+}
+
+// int63 returns a uniformly distributed pseudorandom 63-bit signed positive `i64`.
+pub fn int63() i64 {
+	return default_rng.int63()
+}
+
+// f32 returns a uniformly distributed 32-bit floating point in range `[0, 1)`.
+pub fn f32() f32 {
+	return default_rng.f32()
+}
+
+// f64 returns a uniformly distributed 64-bit floating point in range `[0, 1)`.
+pub fn f64() f64 {
+	return default_rng.f64()
+}
+
+// f32n returns a uniformly distributed 32-bit floating point in range `[0, max)`.
+pub fn f32n(max f32) f32 {
+	return default_rng.f32n(max)
+}
+
+// f64n returns a uniformly distributed 64-bit floating point in range `[0, max)`.
+pub fn f64n(max f64) f64 {
+	return default_rng.f64n(max)
+}
+
+// f32_in_range returns a uniformly distributed 32-bit floating point in range `[min, max)`.
+pub fn f32_in_range(min f32, max f32) f32 {
+	return default_rng.f32_in_range(min, max)
+}
+
+// f64_in_range returns a uniformly distributed 64-bit floating point in range `[min, max)`.
+pub fn f64_in_range(min f64, max f64) f64 {
+	return default_rng.f64_in_range(min, max)
+}
+
+const (
+	english_letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
+	hex_chars       = 'abcdef0123456789'
+	ascii_chars     = '!"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ\\^_`abcdefghijklmnopqrstuvwxyz{|}~'
+)