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I am writing out a comma separated file using a console app, and than using Process to open the file. It's a quick and dirty way of dumping results of a query into excel. for a while this worked fine, but lately i started getting " The file you are trying to open 'blah.csv', is in a different format than specified by the file extension ". and than after clicking "Yes" Excel has detected that blah.csv is a SYLK file, but cannot load it. Either the file has errors or it is not a SYLK file format. Click OK to try to open the file in a different format. Pressing OK opens it, and displays correctly. I see some solutions for this in web world with adding content-disposition header, but since i am using a Process to open it, i can't apply that fix. my code to open the file: ProcessStartInfo info = new ProcessStartInfo(); info.FileName = filePath; info.UseShellExecute = true; Process.Start(info); if i open the file in Notepad++ and show all chars, it just shows as regular CSV with CR LF line endings. after some investigation, it looks like the headings line is triggering the error. If i simply write a empty line before the headings, the error goes away. the headings look like this: heading1,heading2,heading3 CRLF

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