I can't help you with the konqueror issue right now. According to what I can see, texstar has no files for 3.1.4 yet. They will come soon, though.
As far as extracting the file and Ark freezing, why not try it from the command line? What type of file is it?
for tar.gz or .tgz files, use tar -xzvf filename.tar.gz
for zip files -> unzip filename.zip