Hi, I have the following problem. I want to manage Downloads trough a python script, that checks, if the user has permissions to download this file and then reads this file and returns it to Zope. But when I want to download files, that are bigger than 5 MB it tells me, that the file does not exist. Here's the part of the python script that reads the file. Name is the path to the desired file and the filename: def readfile(Name): if os.path.isdir(Name): return 0 if not os.path.exists(Name): return 0 f=open(Name, "rb") d = f.read() f.close() return d And that's the part of the zope DTML document: <dtml-let Download="here is the call for the python function that at first checks the users permissions and then reads the file"> <dtml-if "Download!=0"><dtml-call "RESPONSE.setHeader('Content-Type', guessMimeType(_['Desire']))"><dtml-var Download><dtml-else> <dtml-var standard_html_header> <center> <font color="#FF0000">Sorry, no such File (<dtml-var "_['Desire']">) in <dtml-var "_['area']"> Area</font> <form name=dummy> <input type=button name=back value="back" onClick="document.location='DownloadArea'"> </form> </center> <dtml-var standard_html_footer> </dtml-if> </dtml-let> Hope you can help me. Jens Fellenberg