Not able to upload files

Since may we started to have a problem while truing to upload files… we upload serlf extracting zip files, with .exe extentios, and gave been done this from several years…
Now we are geting the error message: “Subida bloqueada. El tipo de archivo no es válido: la extensión no coincide con el tipo de contenido.” In spanish; “Upload blocked. The file type is invalid: the extension doesn’t match the content type.” translated to englis