Excel export gives csv file occasionally after multiple exports

Hi experts!!
I have the following problem.
After several exports to excel from the web UI the file format turns to csv, even though the user runs MS office 2007.
I found 2 notes describing the issue but these are for other releases and cannot be implemented.
(I am working on CRM 2007)
Any ideas????
Thank you in advance!!!

Hi,
for investigating this problem a short introduction to the Excel-Export function is helpful.
On serverside JavaScript tailored for interaction with the current Table is generated. This code is invoked on the client machine and tries interfacing with Excel via ActiveX-Controls. In a third step the data is requested from the Application Server, this request is processed in the handler class CL_CHTMLB_CONFIG_TAB_EXCEL_EXP.
I guess that the problem is caused by the JavaScript code executed on the client machen. There is a fallback, if no ActiveX-Control could be initialized a csv-File is requested from the server.
I would try some JavaScript debugging, the function thtmlbExcelExport in library scripts.js would be a good entry point.
Regards, Arne

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