LPCONVCONTEXT should be PCONVCONTEXT (spotted by Dimitrie O. Paun).

dlls/user/dde/client.c

@@ -58,7 +58,7 @@ const WCHAR WDML_szClientConvClassW[] = {'D','d','e','C','l','i','e','n','t','U'
  *    Failure: 0
  */
 HCONVLIST WINAPI DdeConnectList(DWORD idInst, HSZ hszService, HSZ hszTopic,
-				HCONVLIST hConvList, LPCONVCONTEXT pCC)
+				HCONVLIST hConvList, PCONVCONTEXT pCC)
 {
     FIXME("(%ld,%p,%p,%p,%p): stub\n", idInst, hszService, hszTopic, hConvList, pCC);
     return (HCONVLIST)1;
@@ -94,7 +94,7 @@ BOOL WINAPI DdeDisconnectList(HCONVLIST hConvList)
  *            DdeConnect   (USER32.@)
  */
 HCONV WINAPI DdeConnect(DWORD idInst, HSZ hszService, HSZ hszTopic,
-			LPCONVCONTEXT pCC)
+			PCONVCONTEXT pCC)
 {
     HWND		hwndClient;
     WDML_INSTANCE*	pInstance;

dlls/user/dde/misc.c

@@ -2027,7 +2027,7 @@ static	BOOL	WDML_GetLocalConvInfo(WDML_CONV* pConv, CONVINFO* ci, DWORD id)
  *		DdeQueryConvInfo (USER32.@)
  *
  */
-UINT WINAPI DdeQueryConvInfo(HCONV hConv, DWORD id, LPCONVINFO lpConvInfo)
+UINT WINAPI DdeQueryConvInfo(HCONV hConv, DWORD id, PCONVINFO lpConvInfo)
 {
     UINT	ret = lpConvInfo->cb;
     CONVINFO	ci;

include/ddeml.h

@@ -292,7 +292,7 @@ typedef struct tagHSZPAIR
 {
     HSZ hszSvc;
     HSZ hszTopic;
-} HSZPAIR, *PHSZPAIR, *LPHSZPAIR;
+} HSZPAIR, *PHSZPAIR;
 
 typedef struct tagCONVCONTEXT
 {
@@ -302,7 +302,7 @@ typedef struct tagCONVCONTEXT
     INT   iCodePage;
     DWORD   dwLangID;
     DWORD   dwSecurity;
-} CONVCONTEXT, *LPCONVCONTEXT;
+} CONVCONTEXT, *PCONVCONTEXT;
 
 typedef struct tagCONVINFO
 {
@@ -322,7 +322,7 @@ typedef struct tagCONVINFO
     CONVCONTEXT		ConvCtxt;
     HWND		hwnd;
     HWND		hwndPartner;
-} CONVINFO, *LPCONVINFO;
+} CONVINFO, *PCONVINFO;
 
 /*            Interface Definitions		*/
 
@@ -331,13 +331,13 @@ UINT    WINAPI DdeInitializeA(LPDWORD,PFNCALLBACK,DWORD,DWORD);
 UINT    WINAPI DdeInitializeW(LPDWORD,PFNCALLBACK,DWORD,DWORD);
 #define   DdeInitialize WINELIB_NAME_AW(DdeInitialize)
 BOOL    WINAPI DdeUninitialize(DWORD);
-HCONVLIST WINAPI DdeConnectList(DWORD,HSZ,HSZ,HCONVLIST,LPCONVCONTEXT);
+HCONVLIST WINAPI DdeConnectList(DWORD,HSZ,HSZ,HCONVLIST,PCONVCONTEXT);
 HCONV     WINAPI DdeQueryNextServer(HCONVLIST, HCONV);
 DWORD     WINAPI DdeQueryStringA(DWORD, HSZ, LPSTR, DWORD, INT);
 DWORD     WINAPI DdeQueryStringW(DWORD, HSZ, LPWSTR, DWORD, INT);
 #define   DdeQueryString WINELIB_NAME_AW(DdeQueryString)
 BOOL      WINAPI DdeDisconnectList(HCONVLIST);
-HCONV     WINAPI DdeConnect(DWORD,HSZ,HSZ,LPCONVCONTEXT);
+HCONV     WINAPI DdeConnect(DWORD,HSZ,HSZ,PCONVCONTEXT);
 BOOL      WINAPI DdeDisconnect(HCONV);
 HDDEDATA  WINAPI DdeCreateDataHandle(DWORD,LPBYTE,DWORD,DWORD,HSZ,UINT,UINT);
 HCONV     WINAPI DdeReconnect(HCONV);
@@ -361,7 +361,7 @@ BOOL      WINAPI DdeSetUserHandle(HCONV,DWORD,DWORD);
 
 HDDEDATA  WINAPI DdeNameService(DWORD,HSZ,HSZ,UINT);
 UINT      WINAPI DdeGetLastError(DWORD);
-UINT      WINAPI DdeQueryConvInfo(HCONV,DWORD,LPCONVINFO);
+UINT      WINAPI DdeQueryConvInfo(HCONV,DWORD,PCONVINFO);
 
 #ifdef __cplusplus
 } /* extern "C" */