That's a good question. We wanted to make something free + userful for users who want to quickly view their documents.
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You can view DOC/DOCX/ODT - XLS/XLSX/ODS/CSV - PPT/PPTX/ODP & PDF - VSD - MPP - TIF - XPS - PSD - DWG - DXF - EML - MSG - TXT - RTF - XML - EPUB - SVG - HTML - MHT - DICOM & Common Image Formats.
Please make sure that the file is not corrupt or is password protected. Send us a link to your file, we will check it at our end.