I installed Evince when it was realeased in this forum and it worked very well. Today I updated Xournal and FBreader and then I noticed that djvu files figured as unknow files

and when I tried to open them they would not open. But if I went to 'programs' and clicked 'evince' it worked.
So I tried to uninstall and install the three programs (FBReader, Xournal and Evince) without results.
I removed all the files from 'programs' folder and updated the DR1000 firmaware to 1.7.1. Then I installed again the extension for djvu, and alas, they were not unknown anymore. But now the problem is that evince do not open. I have tried clicking over the djvu files and clicking directly over 'evince' in 'programs' folder.
I want the djvu back. Help!, please.