The attached document gives an error when it comes to loading into an Aspose.Words.Document. First I convert it into MemoryStream to later load it as an ASPOSE document. It is an ODT document that has a CALC as part of the text.
Recomendación_Tecnica.zip (133.6 KB)
After an initial test with the licensed latest version of Aspose.Words for .NET i.e. 18.9, we were unable to reproduce this issue on our end. So, we would suggest you please upgrade to the latest version of Aspose.Words for .NET. Hope, this helps.
We used the following simple code on our end for testing.
Document doc = new Document("D:\\Recomendación_Tecnica\\Recomendación_Técnica.odt");
doc.Save("D:\\Recomendación_Tecnica\\18.9.odt");
Converted file is also attached: 18.9.zip (217.5 KB)