http://blogs.msdn.com/vsofficedeveloper/archive/tags/Excel/default.aspxTags: Excelen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/vsofficedeveloper/archive/2008/09/10/XL12-XLL-Unicode-Update.aspxWed, 10 Sep 2008 23:25:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:8942044VSOfficeDeveloper0http://blogs.msdn.com/vsofficedeveloper/comments/8942044.aspxhttp://blogs.msdn.com/vsofficedeveloper/commentrss.aspx?PostID=8942044<P>The Microsoft Excel 2007 XLL SDK introduced a&nbsp;new data structure, the XLOPER12, which&nbsp;allows your addin to obtain Unicode strings in XLL function calls.&nbsp; However, there were a couple of limitations with the implemention of the SDK which prevented your XLL from taking full advantage of this new capability.&nbsp;Specifically, while Excel 12 would allow strings in Unicode, some functions would still insist on a 255 character limit if the resulting XLL type was an XLOPER12 type (instead of a LPWSTR type), restricting the length of the overall string.&nbsp; Also, the benefits of the new string type did not carry over to setting strings with the xlSet function, only&nbsp;accepting them as&nbsp;parameters or reading them as results from certain&nbsp;callback functions.</P> <P>Excel development has addressed these limitations in a comprehensive fix for Excel 2007, released as part of the the August 2008 Cumulative Update for Excel 2007 (see <A class="" title=KB956836 href="http://support.microsoft.com/kb/956836/" mce_href="http://support.microsoft.com/kb/956836/">KB956836</A> ).</P><img src="http://blogs.msdn.com/aggbug.aspx?PostID=8942044" width="1" height="1">Excel