First all the mandatory intel...
DNP 2.8.3
Win server 2003, sp2, Enterprise Edition, 32 bit
3rd party version: n/a
Error thrown: Incorrect File
This is a funny one...but DNP file manager cannot create a file called ".htaccess" ...
May seem like a non-starter but it's going to become more and more important as more users are wanting wordpress, drupal, etc. Under IIS6, pretty much the only solution for bulletproof url rewriting is MicrosNovae (micronovae.com) Mod-rewrite pro, and it uses, ta-dah, .htaccess. Its nice to be able to support that because it gives a more seamless move from linux to windows for the end user.
In any case, I know, I know, the windows explorer won't create this file either. You either have to do it via ftp or RDP into the box and do it from the command line. You probably cannot correct this as I bet the APIs you are using won't allow it either, but I'm just reporting it.
You might be able to get around this by having a "create .htaccess" button and then copy an empty .htaccess file over from the enterprise server, or some other hack.