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New Post: Getting Error "Excel cannot open the file '....xlsx' because the file format or file extension is not valid."

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Ok, I guess I'll have to just keep combing through it. The file is writing utf-8 and not creating BOM markers as near as I can tell. It appears to create extra white space, but for the life of me I can't tell where. I don't have a trailing ?> tag. When I open up the file in Notepad++ white space appears at the top. I've tried removing that and resaving, but that still doesn't work, so I'm at a loss - I'll keep combing.



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