RewriteRule in .htaccess doesn't work - apache

Question

I'm a newbie in Apache and I'm trying to shorten the URL of my pages, from
http://mysrvr:9191/my/long/path/to/app.php
to
http://mysrvr:9191/app.php
I thought it could be done with RewriteRule in an .htaccess file, but it didn't work at all, so I tried with a very simple test.
This one doesn't work either.
I will talk about this test.
This is .htaccess in my application folder:
DirectoryIndex robbie.html index4.html
Options +FollowSymLinks
#Edited --- RewriteEngine On
RewriteEngine On
RewriteRule ^(.*)/index4.html$ $1/robbie.html
I tried also
RewriteRule ^(.*)/index4.html$ /$1/robbie.html
But when introduced
http://mysrvr:9191/my/long/path/to/index4.html
none of them two options redirected to
http://mysrvr:9191/my/long/path/to/robbie.html
DirectoryIndex, however, works as expected so I discard the idea of .htaccess being ignored.
This made me think that perhaps mod_rewrite wasn't uploaded but:
> httpd.exe -t -D DUMP_MODULES
[Wed Aug 20 12:04:15 2014] [error] (OS 11004)The requested name is valid, but no data of the requested type was found. : Could not resolve host name hserver.rob.igroup -- ignoring!
Loaded Modules:
core_module (static)
win32_module (static)
mpm_winnt_module (static)
http_module (static)
so_module (static)
actions_module (shared)
alias_module (shared)
asis_module (shared)
auth_basic_module (shared)
authn_default_module (shared)
authn_file_module (shared)
authz_default_module (shared)
authz_groupfile_module (shared)
authz_host_module (shared)
authz_user_module (shared)
autoindex_module (shared)
cgi_module (shared)
dir_module (shared)
env_module (shared)
include_module (shared)
isapi_module (shared)
log_config_module (shared)
mime_module (shared)
negotiation_module (shared)
rewrite_module (shared)
setenvif_module (shared)
php5_module (shared)
Would anyone please share their ideas on this issue?