thank you thomas, but this is already what i've done.
in Windows 2003 the folder is C:\Documents and Settings\All Users\Application Data\QlikTech\QlikViewServer\Extensions\Objects
in Windows 2008 it is C:\ProgramData\QlikTech\QlikViewServer\Extensions\Objects.
Not working for the moment.
this is what the server reference manuel says:
The special folders are stored in the “Data” folder (see Overview (page 53) for the path).
Note! The Extensions folder has to be created manually. By default, QVS looks for extensions in this folder. Extension objects are located in Extensions\Objects and document extensions are located in Extensions\Document. Use QlikView Management Console
Adding Extensions to QlikView Server
To run QlikView Extensions on a QlikView Server, the contents of the Extensions folder have to be copied from %UserProfile%\AppData\Local\QlikTech\QlikView\Extensions\Objects to the %ProgramData%\QlikTech\QlikViewServer\Extensions\Objects folder on the server.
If the path to the extensions is changed (for example, to a common place for all servers in a cluster), that path must be used instead. Note that the path set corresponds to %UserProfile%\AppData\Local\QlikTech\QlikView\Extensions (that is, it does not include \Objects).
but i also had some problems with it, So i just created both folders and C/P it into all folders, and thne it worked, havent tried to debug which one was the correct one yet.
So i pastede my extension into
And i also pasted them into the subfolders. This worked for me