Well the .htaccess file is a known issue with RoundCube. A simple search on the forum would have brought this up and you could have fixed it in about 10 seconds.
The .htaccess won't impede or enhance the use of RoundCube. The only thing it does is hide errors from being displayed, and increase the size of uploads to 2 Megabytes.
It's not that we didn't want to help you, but this isn't a place to get an answer in about 60 minutes, and from your first post, I wouldn't have expected much response anyway. You gave no indication as to what problem you were actually having, nor did you tell us what you were seeing on your screen.
Glad you got it worked out.