diff --git a/dlls/advapi32/security.c b/dlls/advapi32/security.c
index c9d5cfaffad..ae9d6bdeb1b 100644
--- a/dlls/advapi32/security.c
+++ b/dlls/advapi32/security.c
@@ -4211,11 +4211,87 @@ DWORD WINAPI GetExplicitEntriesFromAclA( PACL pacl, PULONG pcCountOfExplicitEntr
 /******************************************************************************
  * GetExplicitEntriesFromAclW [ADVAPI32.@]
  */
-DWORD WINAPI GetExplicitEntriesFromAclW( PACL pacl, PULONG pcCountOfExplicitEntries,
-        PEXPLICIT_ACCESSW* pListOfExplicitEntries)
+DWORD WINAPI GetExplicitEntriesFromAclW( PACL pacl, PULONG count, PEXPLICIT_ACCESSW *list )
 {
-    FIXME("%p %p %p\n",pacl, pcCountOfExplicitEntries, pListOfExplicitEntries);
-    return ERROR_CALL_NOT_IMPLEMENTED;
+    ACL_SIZE_INFORMATION sizeinfo;
+    EXPLICIT_ACCESSW *entries;
+    MAX_SID *sid_entries;
+    ACE_HEADER *ace;
+    NTSTATUS status;
+    int i;
+
+    TRACE("%p %p %p\n",pacl, count, list);
+
+    if (!count || !list)
+        return ERROR_INVALID_PARAMETER;
+
+    status = RtlQueryInformationAcl(pacl, &sizeinfo, sizeof(sizeinfo), AclSizeInformation);
+    if (status) return RtlNtStatusToDosError(status);
+
+    if (!sizeinfo.AceCount)
+    {
+        *count = 0;
+        *list = NULL;
+        return ERROR_SUCCESS;
+    }
+
+    entries = LocalAlloc(LMEM_FIXED | LMEM_ZEROINIT, (sizeof(EXPLICIT_ACCESSW) + sizeof(MAX_SID)) * sizeinfo.AceCount);
+    if (!entries) return ERROR_OUTOFMEMORY;
+    sid_entries = (MAX_SID *)(entries + sizeinfo.AceCount);
+
+    for (i = 0; i < sizeinfo.AceCount; i++)
+    {
+        status = RtlGetAce(pacl, i, (void**)&ace);
+        if (status) goto error;
+
+        switch (ace->AceType)
+        {
+            case ACCESS_ALLOWED_ACE_TYPE:
+            {
+                ACCESS_ALLOWED_ACE *allow = (ACCESS_ALLOWED_ACE *)ace;
+                entries[i].grfAccessMode = GRANT_ACCESS;
+                entries[i].grfInheritance = ace->AceFlags;
+                entries[i].grfAccessPermissions = allow->Mask;
+
+                CopySid(sizeof(MAX_SID), (PSID)&sid_entries[i], (PSID)&allow->SidStart);
+                entries[i].Trustee.pMultipleTrustee = NULL;
+                entries[i].Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
+                entries[i].Trustee.TrusteeForm = TRUSTEE_IS_SID;
+                entries[i].Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
+                entries[i].Trustee.ptstrName = (WCHAR *)&sid_entries[i];
+                break;
+            }
+
+            case ACCESS_DENIED_ACE_TYPE:
+            {
+                ACCESS_DENIED_ACE *deny = (ACCESS_DENIED_ACE *)ace;
+                entries[i].grfAccessMode = DENY_ACCESS;
+                entries[i].grfInheritance = ace->AceFlags;
+                entries[i].grfAccessPermissions = deny->Mask;
+
+                CopySid(sizeof(MAX_SID), (PSID)&sid_entries[i], (PSID)&deny->SidStart);
+                entries[i].Trustee.pMultipleTrustee = NULL;
+                entries[i].Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
+                entries[i].Trustee.TrusteeForm = TRUSTEE_IS_SID;
+                entries[i].Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
+                entries[i].Trustee.ptstrName = (WCHAR *)&sid_entries[i];
+                break;
+            }
+
+            default:
+                FIXME("Unhandled ace type %d\n", ace->AceType);
+                entries[i].grfAccessMode = NOT_USED_ACCESS;
+                continue;
+        }
+    }
+
+    *count = sizeinfo.AceCount;
+    *list = entries;
+    return ERROR_SUCCESS;
+
+error:
+    LocalFree(entries);
+    return RtlNtStatusToDosError(status);
 }
 
 /******************************************************************************
diff --git a/dlls/advapi32/tests/security.c b/dlls/advapi32/tests/security.c
index 73fd7524776..08d3705771b 100644
--- a/dlls/advapi32/tests/security.c
+++ b/dlls/advapi32/tests/security.c
@@ -133,6 +133,7 @@ static BOOL     (WINAPI *pGetWindowsAccountDomainSid)(PSID,PSID,DWORD*);
 static void     (WINAPI *pRtlInitAnsiString)(PANSI_STRING,PCSZ);
 static NTSTATUS (WINAPI *pRtlFreeUnicodeString)(PUNICODE_STRING);
 static PSID_IDENTIFIER_AUTHORITY (WINAPI *pGetSidIdentifierAuthority)(PSID);
+static DWORD    (WINAPI *pGetExplicitEntriesFromAclW)(PACL,PULONG,PEXPLICIT_ACCESSW*);
 
 static HMODULE hmod;
 static int     myARGC;
@@ -227,6 +228,7 @@ static void init(void)
     pGetWindowsAccountDomainSid = (void *)GetProcAddress(hmod, "GetWindowsAccountDomainSid");
     pGetSidIdentifierAuthority = (void *)GetProcAddress(hmod, "GetSidIdentifierAuthority");
     pDuplicateTokenEx = (void *)GetProcAddress(hmod, "DuplicateTokenEx");
+    pGetExplicitEntriesFromAclW = (void *)GetProcAddress(hmod, "GetExplicitEntriesFromAclW");
 
     myARGC = winetest_get_mainargs( &myARGV );
 }
@@ -7098,6 +7100,145 @@ static void test_child_token_sd(void)
     HeapFree(GetProcessHeap(), 0, sd);
 }
 
+static void test_GetExplicitEntriesFromAclW(void)
+{
+    static const WCHAR wszCurrentUser[] = { 'C','U','R','R','E','N','T','_','U','S','E','R','\0'};
+    SID_IDENTIFIER_AUTHORITY SIDAuthWorld = { SECURITY_WORLD_SID_AUTHORITY };
+    SID_IDENTIFIER_AUTHORITY SIDAuthNT = { SECURITY_NT_AUTHORITY };
+    PSID everyone_sid = NULL, users_sid = NULL;
+    EXPLICIT_ACCESSW access;
+    EXPLICIT_ACCESSW *access2;
+    PACL new_acl, old_acl = NULL;
+    ULONG count;
+    DWORD res;
+
+    if (!pGetExplicitEntriesFromAclW)
+    {
+        win_skip("GetExplicitEntriesFromAclW is not available\n");
+        return;
+    }
+
+    if (!pSetEntriesInAclW)
+    {
+        win_skip("SetEntriesInAclW is not available\n");
+        return;
+    }
+
+    old_acl = HeapAlloc(GetProcessHeap(), 0, 256);
+    res = InitializeAcl(old_acl, 256, ACL_REVISION);
+    if(!res && GetLastError() == ERROR_CALL_NOT_IMPLEMENTED)
+    {
+        win_skip("ACLs not implemented - skipping tests\n");
+        HeapFree(GetProcessHeap(), 0, old_acl);
+        return;
+    }
+    ok(res, "InitializeAcl failed with error %d\n", GetLastError());
+
+    res = AllocateAndInitializeSid(&SIDAuthWorld, 1, SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0, &everyone_sid);
+    ok(res, "AllocateAndInitializeSid failed with error %d\n", GetLastError());
+
+    res = AllocateAndInitializeSid(&SIDAuthNT, 2, SECURITY_BUILTIN_DOMAIN_RID,
+                                   DOMAIN_ALIAS_RID_USERS, 0, 0, 0, 0, 0, 0, &users_sid);
+    ok(res, "AllocateAndInitializeSid failed with error %d\n", GetLastError());
+
+    res = AddAccessAllowedAce(old_acl, ACL_REVISION, KEY_READ, users_sid);
+    ok(res, "AddAccessAllowedAce failed with error %d\n", GetLastError());
+
+    access2 = NULL;
+    res = pGetExplicitEntriesFromAclW(old_acl, &count, &access2);
+    ok(res == ERROR_SUCCESS, "GetExplicitEntriesFromAclW failed with error %d\n", GetLastError());
+    ok(count == 1, "Expected count == 1, got %d\n", count);
+    ok(access2[0].grfAccessMode == GRANT_ACCESS, "Expected GRANT_ACCESS, got %d\n", access2[0].grfAccessMode);
+    ok(access2[0].grfAccessPermissions == KEY_READ, "Expected KEY_READ, got %d\n", access2[0].grfAccessPermissions);
+    ok(access2[0].Trustee.TrusteeForm == TRUSTEE_IS_SID, "Expected SID trustee, got %d\n", access2[0].Trustee.TrusteeForm);
+    ok(access2[0].grfInheritance == NO_INHERITANCE, "Expected NO_INHERITANCE, got %x\n", access2[0].grfInheritance);
+    ok(EqualSid(access2[0].Trustee.ptstrName, users_sid), "Expected equal SIDs\n");
+    LocalFree(access2);
+
+    access.Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
+    access.Trustee.pMultipleTrustee = NULL;
+
+    access.grfAccessPermissions = KEY_WRITE;
+    access.grfAccessMode = GRANT_ACCESS;
+    access.grfInheritance = NO_INHERITANCE;
+    access.Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
+    access.Trustee.TrusteeForm = TRUSTEE_IS_SID;
+    access.Trustee.ptstrName = everyone_sid;
+    res = pSetEntriesInAclW(1, &access, old_acl, &new_acl);
+    ok(res == ERROR_SUCCESS, "SetEntriesInAclW failed: %u\n", res);
+    ok(new_acl != NULL, "returned acl was NULL\n");
+
+    access2 = NULL;
+    res = pGetExplicitEntriesFromAclW(new_acl, &count, &access2);
+    ok(res == ERROR_SUCCESS, "GetExplicitEntriesFromAclW failed with error %d\n", GetLastError());
+    ok(count == 2, "Expected count == 2, got %d\n", count);
+    ok(access2[0].grfAccessMode == GRANT_ACCESS, "Expected GRANT_ACCESS, got %d\n", access2[0].grfAccessMode);
+    ok(access2[0].grfAccessPermissions == KEY_WRITE, "Expected KEY_WRITE, got %d\n", access2[0].grfAccessPermissions);
+    ok(access2[0].Trustee.TrusteeType == TRUSTEE_IS_UNKNOWN,
+       "Expected TRUSTEE_IS_UNKNOWN trustee type, got %d\n", access2[0].Trustee.TrusteeType);
+    ok(access2[0].Trustee.TrusteeForm == TRUSTEE_IS_SID, "Expected SID trustee, got %d\n", access2[0].Trustee.TrusteeForm);
+    ok(access2[0].grfInheritance == NO_INHERITANCE, "Expected NO_INHERITANCE, got %x\n", access2[0].grfInheritance);
+    ok(EqualSid(access2[0].Trustee.ptstrName, everyone_sid), "Expected equal SIDs\n");
+    LocalFree(access2);
+    LocalFree(new_acl);
+
+    access.Trustee.TrusteeType = TRUSTEE_IS_UNKNOWN;
+    res = pSetEntriesInAclW(1, &access, old_acl, &new_acl);
+    ok(res == ERROR_SUCCESS, "SetEntriesInAclW failed: %u\n", res);
+    ok(new_acl != NULL, "returned acl was NULL\n");
+
+    access2 = NULL;
+    res = pGetExplicitEntriesFromAclW(new_acl, &count, &access2);
+    ok(res == ERROR_SUCCESS, "GetExplicitEntriesFromAclW failed with error %d\n", GetLastError());
+    ok(count == 2, "Expected count == 2, got %d\n", count);
+    ok(access2[0].grfAccessMode == GRANT_ACCESS, "Expected GRANT_ACCESS, got %d\n", access2[0].grfAccessMode);
+    ok(access2[0].grfAccessPermissions == KEY_WRITE, "Expected KEY_WRITE, got %d\n", access2[0].grfAccessPermissions);
+    ok(access2[0].Trustee.TrusteeType == TRUSTEE_IS_UNKNOWN,
+       "Expected TRUSTEE_IS_UNKNOWN trustee type, got %d\n", access2[0].Trustee.TrusteeType);
+    ok(access2[0].Trustee.TrusteeForm == TRUSTEE_IS_SID, "Expected SID trustee, got %d\n", access2[0].Trustee.TrusteeForm);
+    ok(access2[0].grfInheritance == NO_INHERITANCE, "Expected NO_INHERITANCE, got %x\n", access2[0].grfInheritance);
+    ok(EqualSid(access2[0].Trustee.ptstrName, everyone_sid), "Expected equal SIDs\n");
+    LocalFree(access2);
+    LocalFree(new_acl);
+
+    access.Trustee.TrusteeForm = TRUSTEE_IS_NAME;
+    access.Trustee.ptstrName = (LPWSTR)wszCurrentUser;
+    res = pSetEntriesInAclW(1, &access, old_acl, &new_acl);
+    ok(res == ERROR_SUCCESS, "SetEntriesInAclW failed: %u\n", res);
+    ok(new_acl != NULL, "returned acl was NULL\n");
+
+    access2 = NULL;
+    res = pGetExplicitEntriesFromAclW(new_acl, &count, &access2);
+    ok(res == ERROR_SUCCESS, "GetExplicitEntriesFromAclW failed with error %d\n", GetLastError());
+    ok(count == 2, "Expected count == 2, got %d\n", count);
+    ok(access2[0].grfAccessMode == GRANT_ACCESS, "Expected GRANT_ACCESS, got %d\n", access2[0].grfAccessMode);
+    ok(access2[0].grfAccessPermissions == KEY_WRITE, "Expected KEY_WRITE, got %d\n", access2[0].grfAccessPermissions);
+    ok(access2[0].Trustee.TrusteeType == TRUSTEE_IS_UNKNOWN,
+       "Expected TRUSTEE_IS_UNKNOWN trustee type, got %d\n", access2[0].Trustee.TrusteeType);
+    ok(access2[0].Trustee.TrusteeForm == TRUSTEE_IS_SID, "Expected SID trustee, got %d\n", access2[0].Trustee.TrusteeForm);
+    ok(access2[0].grfInheritance == NO_INHERITANCE, "Expected NO_INHERITANCE, got %x\n", access2[0].grfInheritance);
+    LocalFree(access2);
+    LocalFree(new_acl);
+
+    access.grfAccessMode = REVOKE_ACCESS;
+    access.Trustee.TrusteeForm = TRUSTEE_IS_SID;
+    access.Trustee.ptstrName = users_sid;
+    res = pSetEntriesInAclW(1, &access, old_acl, &new_acl);
+    ok(res == ERROR_SUCCESS, "SetEntriesInAclW failed: %u\n", res);
+    ok(new_acl != NULL, "returned acl was NULL\n");
+
+    access2 = (void *)0xdeadbeef;
+    res = pGetExplicitEntriesFromAclW(new_acl, &count, &access2);
+    ok(res == ERROR_SUCCESS, "GetExplicitEntriesFromAclW failed with error %d\n", GetLastError());
+    ok(count == 0, "Expected count == 0, got %d\n", count);
+    ok(access2 == NULL, "access2 was not NULL\n");
+    LocalFree(new_acl);
+
+    FreeSid(users_sid);
+    FreeSid(everyone_sid);
+    HeapFree(GetProcessHeap(), 0, old_acl);
+}
+
 START_TEST(security)
 {
     init();
@@ -7151,6 +7292,7 @@ START_TEST(security)
     test_pseudo_tokens();
     test_maximum_allowed();
     test_token_label();
+    test_GetExplicitEntriesFromAclW();
 
     /* Must be the last test, modifies process token */
     test_token_security_descriptor();