Are there certain filetypes that are not allowed to upload to Place?

There is a blacklist for filetypes that’s prevented from being uploaded to Place due to security:

"exe", "app", "vb", "dll", "scr", "html", "htm", "sh", "js", "jsp", "php", "php5", "pht", "phtml", "shtml", "asa", "cer", "asax", "swf", "xap"

To see all file types that are accepted, check this article.