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POOpenXML documents, how do you know which is which, when there is no extention
 

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    <p>What i have done for now, and which works is this:</p> <pre><code>private string DetermineOpenXML(string file) { try { SpreadsheetDocument doc = SpreadsheetDocument.Open(file, false); doc.Close(); return ".xslx"; } catch { try { WordprocessingDocument doc = WordprocessingDocument.Open(file, false); doc.Close(); return ".docx"; } catch { try { PresentationDocument doc = PresentationDocument.Open(file, false); doc.Close(); return ".pptx"; } catch { return string.Empty; } } } } </code></pre> <p>I think there must be a better way to see what kind of file it is other than just trial and error. The thing is, i am working on a small program, that finds out what file extension files should have. The reason i do this is because i have the files from a database, where they are saved sometimes without extension and other times with a wrong extension.</p> <p>What i have done with these files is that i found out that all OpenXML documents share the same File signature: "50 4B 03 04 14 00 06 00", which is close to a signature of a zip file, and i can also open OpenXML files with a zip program and see its content. And maybe this is the solution i should go for, i was just hoping that it would be faster / easier to use OpenXML SDK and that it had a property or something that could check it for me.</p> <p>Edit: I have added a answer, i would still like to see if there was a better solution, even though there it works for my current purpose. It does not take in for account that the extensions should have been template files.</p>
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