You may get an 'Invalid file' error when you want to upload an image, video or file to you your Concrete5 website. This is a simple How-To to fix this issue.
flv, jpg, gif, jpeg, ico, docx, xla, png, psd, swf, doc, txt, xls, xlsx, csv, pdf, tiff, rtf, m4a, mov, wmv, mpeg, mpg, wav, avi, m4v, mp4, mp3, qt, ppt, pptx, kml, xml
If you f… http://poczta.wagdi.co.uk/index.php/blog/invalid-file-error-on-file-uploads/
