diff --git a/.github/workflows/conda-dev.yml b/.github/workflows/conda-dev.yml
index 92600166f..f7523a1a5 100644
--- a/.github/workflows/conda-dev.yml
+++ b/.github/workflows/conda-dev.yml
@@ -34,7 +34,7 @@ jobs:
           - os: 'windows-2019'
             generator: 'Ninja'
             build_type: 'Debug'
-            extra_args: '-DBUILD_SHARED_LIBS=OFF -DABC_USE_NO_READLINE=ON -DVENDOR_GTEST=ON'
+            extra_args: '-DBUILD_SHARED_LIBS=OFF -DABC_USE_NO_PTHREADS=ON -DABC_USE_NO_READLINE=ON -DVENDOR_GTEST=ON'
     env:
       OS: ${{ matrix.os }}
       PY_VER: ${{ matrix.python-version }}
@@ -42,6 +42,21 @@ jobs:
       CMAKE_ARGS: ${{ matrix.use_namespace && '-DABC_USE_NAMESPACE=xxx' || '' }}
 
     steps:
+    #- if: matrix.os == 'windows-2019'
+      #name: Install newer windows compiler
+      #id: install_cc
+      #uses: rlalik/setup-cpp-compiler@master
+      #with:
+        #compiler: g++-11.2.0
+
+    #- if: matrix.os == 'windows-2019'
+      #name: Use compiler
+      #shell: bash -l {0}
+      #env:
+          #CC: ${{ steps.install_cc.outputs.cc }}
+          #CXX: ${{ steps.install_cc.outputs.cxx }}
+      #run: |
+
     - uses: actions/checkout@v4
 
     - name: Setup base python
@@ -49,12 +64,24 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
+    - name: Prepare build environment for windows
+      if: runner.os == 'Windows'
+      uses: ilammy/msvc-dev-cmd@v1
+      with:
+        arch: x64
+
+    - name: Env (Windows)
+      if: runner.os == 'Windows'
+      run: |
+        echo "CXX=cl.exe" >> $GITHUB_ENV
+        echo "CC=cl.exe" >> $GITHUB_ENV
+
     - name: Cache conda
       id: cache
       uses: actions/cache@v4
       env:
         # Increase this value to reset cache if environment.devenv.yml has not changed
-        CACHE_NUMBER: 1
+        CACHE_NUMBER: 2
       with:
         path: ~/conda_pkgs_dir
         key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{ hashFiles('environment.devenv.yml') }}
diff --git a/CMakeLists.txt b/CMakeLists.txt
index b5fc49ff2..43735a618 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -182,6 +182,7 @@ elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
             "_MBCS"
             "_SCL_SECURE_NO_WARNINGS"
             "_CRT_SECURE_NO_WARNINGS"
+            "_CRT_INTERNAL_NONSTDC_NAMES"
             "_XKEYCHECK_H"
             "_ALLOW_KEYWORD_MACROS=1"
     )
diff --git a/src/base/abc/abcHieNew.c b/src/base/abc/abcHieNew.c
index 54a61609f..5906bf476 100644
--- a/src/base/abc/abcHieNew.c
+++ b/src/base/abc/abcHieNew.c
@@ -1488,7 +1488,7 @@ Gia_Man_t * Au_ManDeriveTest( Abc_Ntk_t * pRoot )
     extern Vec_Ptr_t * Abc_NtkCollectHie( Abc_Ntk_t * pNtk );
 
 //    char * pModelName = NULL;
-    char * pModelName = "path_0_r_x_lhs";
+    char pModelName[] = "path_0_r_x_lhs";
     Gia_Man_t * pGia = NULL;
     Vec_Ptr_t * vOrder, * vModels;
     Abc_Ntk_t * pMod;
diff --git a/src/sat/kissat/colors.c b/src/sat/kissat/colors.c
index c6141b749..7c41fba61 100644
--- a/src/sat/kissat/colors.c
+++ b/src/sat/kissat/colors.c
@@ -1,6 +1,7 @@
 #include "colors.h"
 
 #if defined(WIN32) && !defined(__MINGW32__)
+#include <io.h>
 #define isatty _isatty
 #else
 #include <unistd.h>
diff --git a/src/sat/kissat/file.c b/src/sat/kissat/file.c
index e4486783d..4aaed520b 100644
--- a/src/sat/kissat/file.c
+++ b/src/sat/kissat/file.c
@@ -5,14 +5,19 @@
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
+
 #include <sys/stat.h>
 #include <sys/types.h>
 
 #ifdef WIN32
+#include <io.h>
 #define unlink _unlink
 #define access _access
 #define R_OK 4
 #define W_OK 2
+#ifndef S_ISDIR
+#  define S_ISDIR(mode)  (((mode) & _S_IFMT) == _S_IFDIR)
+#endif
 #else
 #include <unistd.h>
 #endif
diff --git a/src/sat/kissat/proplit.h b/src/sat/kissat/proplit.h
index be0632d0c..203c1eb39 100644
--- a/src/sat/kissat/proplit.h
+++ b/src/sat/kissat/proplit.h
@@ -8,7 +8,7 @@ static inline void kissat_watch_large_delayed (kissat *solver,
   while (d != end_delayed) {
     const unsigned lit = *d++;
     KISSAT_assert (d != end_delayed);
-    const watch watch = {.raw = *d++};
+    const watch watch = {/*.raw =*/ *d++};  // c++20 only
     KISSAT_assert (!watch.type.binary);
     KISSAT_assert (lit < LITS);
     watches *const lit_watches = all_watches + lit;
diff --git a/src/sat/kissat/walk.c b/src/sat/kissat/walk.c
index 72ce38a6c..18ebdd679 100644
--- a/src/sat/kissat/walk.c
+++ b/src/sat/kissat/walk.c
@@ -28,7 +28,7 @@ struct tagged {
 
 static inline tagged make_tagged (bool binary, unsigned ref) {
   KISSAT_assert (ref <= MAX_WALK_REF);
-  tagged res = {.ref = ref, .binary = binary};
+  tagged res = {/*.ref = */ref, /*.binary = */binary};  // c++20 only
   return res;
 }