Regarding Attachments in Collaboration tasks

hi,
I have created tasks and have attachments along with the same. But when i open any type file other than text i get an error. Can anybody give any pointers on this?
Also,
Can i add attachments while creation of tasks or do i have to edit tasks and add attachments?
One more query....is there any facility of exporting tasks list to excel sheet??
Thanks and regards,
Akshay

Hi,
senthil's comment is probably no big help, as the worklfow repository where the attachments are stored uses a non ACL-based security manager.
If you look there
http://help.sap.com/saphelp_nw2004s/helpdata/en/da/e39b419b6ea109e10000000a155106/frameset.htm
This security manager gives the users automatically permissions depending on the permissions the user has on the folder where the original object is created.
For tasks I am actually not quite sure, what is to be done now, as permission on tasks are not good documented. E.g. the eu_role is sufficient to create a task.
Did you already try giving the user the Collaboration Role?
Or are you working in a room?
If you can provide me with the steps you did to create the task and the environment (room template you used or standard roles you have assigned) I maybe can try to repeat it.
Regards,
Sascha

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Regarding Attachments in Collaboration tasks

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