diff --git a/dll/win32/imm32/imm.c b/dll/win32/imm32/imm.c
index 67aab7c5a60..84ab597c381 100644
--- a/dll/win32/imm32/imm.c
+++ b/dll/win32/imm32/imm.c
@@ -2758,17 +2758,184 @@ UINT WINAPI ImmGetDescriptionW(HKL hKL, LPWSTR lpszDescription, UINT uBufLen)
     return (UINT)cch;
 }
 
+static DWORD APIENTRY
+ImmGetGuideLineAW(HIMC hIMC, DWORD dwIndex, LPVOID lpBuf, DWORD dwBufLen, BOOL bAnsi)
+{
+    PCLIENTIMC pClientImc;
+    LPINPUTCONTEXT pIC;
+    LPGUIDELINE pGuideLine;
+    DWORD cb, ret = 0;
+    LPVOID pvStr, pvPrivate;
+    BOOL bUsedDefault;
+
+    pClientImc = ImmLockClientImc(hIMC);
+    if (!pClientImc)
+        return 0;
+
+    pIC = ImmLockIMC(hIMC);
+    if (!pIC)
+    {
+        ImmUnlockClientImc(pClientImc);
+        return 0;
+    }
+
+    pGuideLine = ImmLockIMCC(pIC->hGuideLine);
+    if (!pGuideLine)
+    {
+        ImmUnlockIMC(hIMC);
+        ImmUnlockClientImc(pClientImc);
+        return 0;
+    }
+
+    if (dwIndex == GGL_LEVEL)
+    {
+        ret = pGuideLine->dwLevel;
+        goto Quit;
+    }
+
+    if (dwIndex == GGL_INDEX)
+    {
+        ret = pGuideLine->dwIndex;
+        goto Quit;
+    }
+
+    if (dwIndex == GGL_STRING)
+    {
+        pvStr = (LPBYTE)pGuideLine + pGuideLine->dwStrOffset;
+
+        /* get size */
+        if (bAnsi)
+        {
+            if (pClientImc->dwFlags & CLIENTIMC_WIDE)
+            {
+                cb = WideCharToMultiByte(CP_ACP, 0, pvStr, pGuideLine->dwStrLen,
+                                         NULL, 0, NULL, &bUsedDefault);
+            }
+            else
+            {
+                cb = pGuideLine->dwStrLen * sizeof(CHAR);
+            }
+        }
+        else
+        {
+            if (pClientImc->dwFlags & CLIENTIMC_WIDE)
+            {
+                cb = pGuideLine->dwStrLen * sizeof(WCHAR);
+            }
+            else
+            {
+                cb = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, pvStr, pGuideLine->dwStrLen,
+                                         NULL, 0) * sizeof(WCHAR);
+            }
+        }
+
+        if (dwBufLen == 0 || cb == 0 || lpBuf == NULL || dwBufLen < cb)
+        {
+            ret = cb;
+            goto Quit;
+        }
+
+        /* store to buffer */
+        if (bAnsi)
+        {
+            if (pClientImc->dwFlags & CLIENTIMC_WIDE)
+            {
+                ret = WideCharToMultiByte(CP_ACP, 0, pvStr, pGuideLine->dwStrLen,
+                                          lpBuf, dwBufLen, NULL, &bUsedDefault);
+                goto Quit;
+            }
+        }
+        else
+        {
+            if (!(pClientImc->dwFlags & CLIENTIMC_WIDE))
+            {
+                ret = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, pvStr, pGuideLine->dwStrLen,
+                                          lpBuf, dwBufLen) * sizeof(WCHAR);
+                goto Quit;
+            }
+        }
+
+        RtlCopyMemory(lpBuf, pvStr, cb);
+        ret = cb;
+        goto Quit;
+    }
+
+    if (dwIndex == GGL_PRIVATE)
+    {
+        pvPrivate = (LPBYTE)pGuideLine + pGuideLine->dwPrivateOffset;
+
+        /* get size */
+        if (bAnsi)
+        {
+            if ((pClientImc->dwFlags & CLIENTIMC_WIDE) &&
+                pGuideLine->dwIndex == GL_ID_REVERSECONVERSION)
+            {
+                cb = CandidateListWideToAnsi(pvPrivate, NULL, 0, CP_ACP);
+            }
+            else
+            {
+                cb = pGuideLine->dwPrivateSize;
+            }
+        }
+        else
+        {
+            if (!(pClientImc->dwFlags & CLIENTIMC_WIDE) &&
+                pGuideLine->dwIndex == GL_ID_REVERSECONVERSION)
+            {
+                cb = CandidateListAnsiToWide(pvPrivate, NULL, 0, CP_ACP);
+            }
+            else
+            {
+                cb = pGuideLine->dwPrivateSize;
+            }
+        }
+
+        if (dwBufLen == 0 || cb == 0 || lpBuf == NULL || dwBufLen < cb)
+        {
+            ret = cb;
+            goto Quit;
+        }
+
+        /* store to buffer */
+        if (bAnsi)
+        {
+            if ((pClientImc->dwFlags & CLIENTIMC_WIDE) &&
+                pGuideLine->dwIndex == GL_ID_REVERSECONVERSION)
+            {
+                ret = CandidateListWideToAnsi(pvPrivate, lpBuf, cb, CP_ACP);
+                goto Quit;
+            }
+        }
+        else
+        {
+            if (!(pClientImc->dwFlags & CLIENTIMC_WIDE) &&
+                pGuideLine->dwIndex == GL_ID_REVERSECONVERSION)
+            {
+                ret = CandidateListAnsiToWide(pvPrivate, lpBuf, cb, CP_ACP);
+                goto Quit;
+            }
+        }
+
+        RtlCopyMemory(lpBuf, pvPrivate, cb);
+        ret = cb;
+        goto Quit;
+    }
+
+Quit:
+    ImmUnlockIMCC(pIC->hGuideLine);
+    ImmUnlockIMC(hIMC);
+    ImmUnlockClientImc(pClientImc);
+    return ret;
+}
+
 /***********************************************************************
  *		ImmGetGuideLineA (IMM32.@)
  */
 DWORD WINAPI ImmGetGuideLineA(
   HIMC hIMC, DWORD dwIndex, LPSTR lpBuf, DWORD dwBufLen)
 {
-  FIXME("(%p, %d, %s, %d): stub\n",
-    hIMC, dwIndex, debugstr_a(lpBuf), dwBufLen
-  );
-  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
-  return 0;
+    TRACE("(%p, %lu, %p, %lu)\n", hIMC, dwIndex, lpBuf, dwBufLen);
+    return ImmGetGuideLineAW(hIMC, dwIndex, lpBuf, dwBufLen, TRUE);
 }
 
 /***********************************************************************
@@ -2776,11 +2943,8 @@ DWORD WINAPI ImmGetGuideLineA(
  */
 DWORD WINAPI ImmGetGuideLineW(HIMC hIMC, DWORD dwIndex, LPWSTR lpBuf, DWORD dwBufLen)
 {
-  FIXME("(%p, %d, %s, %d): stub\n",
-    hIMC, dwIndex, debugstr_w(lpBuf), dwBufLen
-  );
-  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
-  return 0;
+    TRACE("(%p, %lu, %p, %lu)\n", hIMC, dwIndex, lpBuf, dwBufLen);
+    return ImmGetGuideLineAW(hIMC, dwIndex, lpBuf, dwBufLen, FALSE);
 }
 
 /***********************************************************************