File Corruption

[Randy Grafton]

I originally posted this question to the Apache list and was strongly 
encouraged to try here. 

I have a FreeBSD 4.8 server running Apache 2.0.48a (installed from the 
ports). This server is dedicated to hosting files for download through http 
and ftp. 99.99% of the downloads occur through http. Our situation is we 
have a Win2K server with our primary website on IIS. There are ASP generated 
pages that provide links to the files on the FreeBSD/Apache server. The IIS 
links are done with a Response.Redirect "http://freebsdServer/dir/file.exe". 
I don't know ASP so I'm a little clueless to the difference of this code 
compared to a standard html anchor with its href value set to this path/url.
The files on this server vary in size up to 150MB. The files are self 
extracting/install demos of some of our products. The problem is that every 
so often the large files become corrupted. We'll end up getting a call from 
a customer stating that after a couple of download attempts the installer 
file crashes. We'll go and grab the file ourselves through ftp/sftp and sure 
enough the file is no longer functional and we'll have to replace it with 
another copy. 

I googled and searched the lists but have only found tips regarding speeding 
up http downloads, (reverting to the current Apache 1.3.x version). 

Should I be using a database to store the file with it delivered through PHP 
scripts? Are there OS or Apache settings that I should have made to 
accommodate this purpose? (The config files are pretty plain vanilla). 

Thank you for any suggestion,
 -Randy