diff --git a/dlls/msvcrt/concurrency.c b/dlls/msvcrt/concurrency.c
index e5a24f13855..18138901594 100644
--- a/dlls/msvcrt/concurrency.c
+++ b/dlls/msvcrt/concurrency.c
@@ -2731,7 +2731,7 @@ void __cdecl Concurrency_wait(unsigned int time)
 /* ?_Trace_agents@Concurrency@@YAXW4Agents_EventType@1@_JZZ */
 void WINAPIV _Trace_agents(/*enum Concurrency::Agents_EventType*/int type, __int64 id, ...)
 {
-    FIXME("(%d %s)\n", type, wine_dbgstr_longlong(id));
+    FIXME("(%d %#I64x)\n", type, id);
 }
 #endif
 
diff --git a/dlls/msvcrt/console.c b/dlls/msvcrt/console.c
index 2c549c1e7a5..2b47287c5c7 100644
--- a/dlls/msvcrt/console.c
+++ b/dlls/msvcrt/console.c
@@ -578,7 +578,7 @@ int CDECL __conio_common_vcprintf(unsigned __int64 options, const char* format,
                                         _locale_t locale, va_list valist)
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     return pf_printf_a(puts_clbk_console_a, NULL, format, locale,
              options & UCRTBASE_PRINTF_MASK, arg_clbk_valist, NULL, &valist);
 }
@@ -590,7 +590,7 @@ int CDECL __conio_common_vcwprintf(unsigned __int64 options, const wchar_t* form
                                          _locale_t locale, va_list valist)
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     return pf_printf_w(puts_clbk_console_w, NULL, format, locale,
              options & UCRTBASE_PRINTF_MASK, arg_clbk_valist, NULL, &valist);
 }
diff --git a/dlls/msvcrt/except_x86_64.c b/dlls/msvcrt/except_x86_64.c
index 15ba21b0c44..d40b9985cd2 100644
--- a/dlls/msvcrt/except_x86_64.c
+++ b/dlls/msvcrt/except_x86_64.c
@@ -738,8 +738,8 @@ void __cdecl _local_unwind( void *frame, void *target )
 int __cdecl _fpieee_flt(__msvcrt_ulong exception_code, EXCEPTION_POINTERS *ep,
         int (__cdecl *handler)(_FPIEEE_RECORD*))
 {
-    FIXME("(%lx %p %p) opcode: %s\n", exception_code, ep, handler,
-            wine_dbgstr_longlong(*(ULONG64*)ep->ContextRecord->Rip));
+    FIXME("(%lx %p %p) opcode: %#I64x\n", exception_code, ep, handler,
+            *(ULONG64*)ep->ContextRecord->Rip);
     return EXCEPTION_CONTINUE_SEARCH;
 }
 
diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c
index f62d7704eed..7c39a50a656 100644
--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -1290,11 +1290,10 @@ __int64 CDECL _lseeki64(int fd, __int64 offset, int whence)
     return -1;
   }
 
-  TRACE(":fd (%d) to %s pos %s\n",
-        fd,wine_dbgstr_longlong(offset),
-        (whence==SEEK_SET)?"SEEK_SET":
-        (whence==SEEK_CUR)?"SEEK_CUR":
-        (whence==SEEK_END)?"SEEK_END":"UNKNOWN");
+  TRACE(":fd (%d) to %#I64x pos %s\n",
+          fd, offset, (whence == SEEK_SET) ? "SEEK_SET" :
+          (whence == SEEK_CUR) ? "SEEK_CUR" :
+          (whence == SEEK_END) ? "SEEK_END" : "UNKNOWN");
 
   /* The MoleBox protection scheme expects msvcrt to use SetFilePointer only,
    * so a LARGE_INTEGER offset cannot be passed directly via SetFilePointerEx. */
@@ -1468,7 +1467,7 @@ int CDECL _chsize_s(int fd, __int64 size)
     __int64 cur, pos;
     BOOL ret = FALSE;
 
-    TRACE("(fd=%d, size=%s)\n", fd, wine_dbgstr_longlong(size));
+    TRACE("(fd=%d, size=%#I64x)\n", fd, size);
 
     if (!MSVCRT_CHECK_PMT(size >= 0)) return EINVAL;
 
@@ -3061,9 +3060,8 @@ int CDECL _stat64(const char* path, struct _stat64 * buf)
   buf->st_atime = dw;
   RtlTimeToSecondsSince1970((LARGE_INTEGER *)&hfi.ftLastWriteTime, &dw);
   buf->st_mtime = buf->st_ctime = dw;
-  TRACE("%d %d 0x%08x%08x %d %d %d\n", buf->st_mode,buf->st_nlink,
-        (int)(buf->st_size >> 32),(int)buf->st_size,
-        (int)buf->st_atime,(int)buf->st_mtime,(int)buf->st_ctime);
+  TRACE("%d %d %#I64x %I64d %I64d %I64d\n", buf->st_mode, buf->st_nlink,
+          buf->st_size, buf->st_atime, buf->st_mtime, buf->st_ctime);
   return 0;
 }
 
@@ -3212,9 +3210,8 @@ int CDECL _wstat64(const wchar_t* path, struct _stat64 * buf)
   buf->st_atime = dw;
   RtlTimeToSecondsSince1970((LARGE_INTEGER *)&hfi.ftLastWriteTime, &dw);
   buf->st_mtime = buf->st_ctime = dw;
-  TRACE("%d %d 0x%08x%08x %d %d %d\n", buf->st_mode,buf->st_nlink,
-        (int)(buf->st_size >> 32),(int)buf->st_size,
-        (int)buf->st_atime,(int)buf->st_mtime,(int)buf->st_ctime);
+  TRACE("%d %d %#I64x %I64d %I64d %I64d\n", buf->st_mode, buf->st_nlink,
+          buf->st_size, buf->st_atime, buf->st_mtime, buf->st_ctime);
   return 0;
 }
 
@@ -5272,7 +5269,7 @@ int CDECL _stdio_common_vfprintf(unsigned __int64 options, FILE *file, const cha
                                         _locale_t locale, va_list valist)
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
 
     return vfprintf_helper(options & UCRTBASE_PRINTF_MASK, file, format, locale, valist);
 }
@@ -5284,7 +5281,7 @@ int CDECL __stdio_common_vfprintf_p(unsigned __int64 options, FILE *file, const
                                           _locale_t locale, va_list valist)
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
 
     return vfprintf_helper((options & UCRTBASE_PRINTF_MASK) | MSVCRT_PRINTF_POSITIONAL_PARAMS
             | MSVCRT_PRINTF_INVOKE_INVALID_PARAM_HANDLER, file, format, locale, valist);
@@ -5298,7 +5295,7 @@ int CDECL __stdio_common_vfprintf_s(unsigned __int64 options, FILE *file, const
                                           _locale_t locale, va_list valist)
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
 
     return vfprintf_helper((options & UCRTBASE_PRINTF_MASK) | MSVCRT_PRINTF_INVOKE_INVALID_PARAM_HANDLER,
             file, format, locale, valist);
@@ -5311,7 +5308,7 @@ int CDECL __stdio_common_vfwprintf(unsigned __int64 options, FILE *file, const w
                                          _locale_t locale, va_list valist)
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
 
     return vfwprintf_helper(options & UCRTBASE_PRINTF_MASK, file, format, locale, valist);
 }
@@ -5323,7 +5320,7 @@ int CDECL __stdio_common_vfwprintf_p(unsigned __int64 options, FILE *file, const
                                            _locale_t locale, va_list valist)
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
 
     return vfwprintf_helper((options & UCRTBASE_PRINTF_MASK) | MSVCRT_PRINTF_POSITIONAL_PARAMS
             | MSVCRT_PRINTF_INVOKE_INVALID_PARAM_HANDLER, file, format, locale, valist);
@@ -5337,7 +5334,7 @@ int CDECL __stdio_common_vfwprintf_s(unsigned __int64 options, FILE *file, const
                                            _locale_t locale, va_list valist)
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
 
     return vfwprintf_helper((options & UCRTBASE_PRINTF_MASK) | MSVCRT_PRINTF_INVOKE_INVALID_PARAM_HANDLER,
             file, format, locale, valist);
diff --git a/dlls/msvcrt/scanf.c b/dlls/msvcrt/scanf.c
index 0e59d741e1e..89575101471 100644
--- a/dlls/msvcrt/scanf.c
+++ b/dlls/msvcrt/scanf.c
@@ -674,7 +674,7 @@ int CDECL __stdio_common_vsscanf(unsigned __int64 options,
      * scanf. LEGACY_MSVCRT_COMPATIBILITY affects parsing of nan/inf,
      * but parsing of those isn't implemented at all yet. */
     if (options & ~UCRTBASE_SCANF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     if (options & _CRT_INTERNAL_SCANF_SECURECRT)
         return vsnscanf_s_l(input, length, format, locale, valist);
     else
@@ -694,7 +694,7 @@ int CDECL __stdio_common_vswscanf(unsigned __int64 options,
      * scanf. LEGACY_MSVCRT_COMPATIBILITY affects parsing of nan/inf,
      * but parsing of those isn't implemented at all yet. */
     if (options & ~UCRTBASE_SCANF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     if (options & _CRT_INTERNAL_SCANF_SECURECRT)
         return vsnwscanf_s_l(input, length, format, locale, valist);
     else
@@ -711,7 +711,7 @@ int CDECL __stdio_common_vfscanf(unsigned __int64 options,
                                        va_list valist)
 {
     if (options & ~_CRT_INTERNAL_SCANF_SECURECRT)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     if (options & _CRT_INTERNAL_SCANF_SECURECRT)
         return vfscanf_s_l(file, format, locale, valist);
     else
@@ -728,7 +728,7 @@ int CDECL __stdio_common_vfwscanf(unsigned __int64 options,
                                         va_list valist)
 {
     if (options & ~_CRT_INTERNAL_SCANF_SECURECRT)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     if (options & _CRT_INTERNAL_SCANF_SECURECRT)
         return vfwscanf_s_l(file, format, locale, valist);
     else
diff --git a/dlls/msvcrt/string.c b/dlls/msvcrt/string.c
index d92b7a38d12..3b352ac0bf2 100644
--- a/dlls/msvcrt/string.c
+++ b/dlls/msvcrt/string.c
@@ -377,8 +377,8 @@ int fpnum_double(struct fpnum *fp, double *d)
         return 0;
     }
 
-    TRACE("%c %s *2^%d (round %d)\n", fp->sign == -1 ? '-' : '+',
-            wine_dbgstr_longlong(fp->m), fp->exp, fp->mod);
+    TRACE("%c %#I64x *2^%d (round %d)\n", fp->sign == -1 ? '-' : '+',
+            fp->m, fp->exp, fp->mod);
     if (!fp->m)
     {
         *d = fp->sign * 0.0;
@@ -467,7 +467,7 @@ int fpnum_double(struct fpnum *fp, double *d)
     bits |= (ULONGLONG)fp->exp << (MANT_BITS - 1);
     bits |= fp->m & (((ULONGLONG)1 << (MANT_BITS - 1)) - 1);
 
-    TRACE("returning %s\n", wine_dbgstr_longlong(bits));
+    TRACE("returning %#I64x\n", bits);
     *d = *(double*)&bits;
     return 0;
 }
@@ -496,8 +496,8 @@ int fpnum_ldouble(struct fpnum *fp, MSVCRT__LDOUBLE *d)
         return 0;
     }
 
-    TRACE("%c %s *2^%d (round %d)\n", fp->sign == -1 ? '-' : '+',
-            wine_dbgstr_longlong(fp->m), fp->exp, fp->mod);
+    TRACE("%c %#I64x *2^%d (round %d)\n", fp->sign == -1 ? '-' : '+',
+            fp->m, fp->exp, fp->mod);
     if (!fp->m)
     {
         d->x80[0] = 0;
diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index ce2974f4051..86875954551 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -919,7 +919,7 @@ int CDECL __stdio_common_vsprintf( unsigned __int64 options, char *str, size_t l
     int ret;
 
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     ret = pf_printf_a(puts_clbk_str_c99_a,
             &ctx, format, (_locale_t)locale, options & UCRTBASE_PRINTF_MASK, arg_clbk_valist, NULL, &valist);
     puts_clbk_str_a(&ctx, 1, &nullbyte);
@@ -1110,7 +1110,7 @@ int CDECL __stdio_common_vsnprintf_s( unsigned __int64 options,
         const char *format, _locale_t locale, va_list valist )
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     return vsnprintf_s_l_opt(str, sizeOfBuffer, count, format, options & UCRTBASE_PRINTF_MASK, locale, valist);
 }
 
@@ -1122,7 +1122,7 @@ int CDECL __stdio_common_vsnwprintf_s( unsigned __int64 options,
         const wchar_t *format, _locale_t locale, va_list valist )
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     return vsnwprintf_s_l_opt(str, sizeOfBuffer, count, format, options & UCRTBASE_PRINTF_MASK, locale, valist);
 }
 
@@ -1144,7 +1144,7 @@ int CDECL __stdio_common_vsprintf_s( unsigned __int64 options,
         _locale_t locale, va_list valist )
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     return vsnprintf_s_l_opt(str, INT_MAX, count, format, options & UCRTBASE_PRINTF_MASK, locale, valist);
 }
 
@@ -1419,7 +1419,7 @@ int CDECL __stdio_common_vswprintf_p( unsigned __int64 options,
         _locale_t locale, va_list valist )
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     return vswprintf_p_l_opt(str, count, format, options & UCRTBASE_PRINTF_MASK, locale, valist);
 }
 #endif
@@ -1532,7 +1532,7 @@ int CDECL __stdio_common_vswprintf( unsigned __int64 options,
     int ret;
 
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     ret = pf_printf_w(puts_clbk_str_c99_w,
             &ctx, format, locale, options & UCRTBASE_PRINTF_MASK, arg_clbk_valist, NULL, &valist);
     puts_clbk_str_w(&ctx, 1, L"");
@@ -1795,7 +1795,7 @@ int CDECL __stdio_common_vsprintf_p(unsigned __int64 options, char *buffer, size
         const char *format, _locale_t locale, va_list args)
 {
     if (options & ~UCRTBASE_PRINTF_MASK)
-        FIXME("options %s not handled\n", wine_dbgstr_longlong(options));
+        FIXME("options %#I64x not handled\n", options);
     return vsprintf_p_l_opt(buffer, length, format, options & UCRTBASE_PRINTF_MASK, locale, args);
 }
 #endif