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Offline attribute
Files provided by KONNEKT can be marked with the offline attribute (see also FILE_ATTRIBUTE_OFFLINE). This offline attribute signals to other system components like the Windows Explorer that the file is not locally available. This prevents components like preview, search and indexing from accessing the files.
Marking files with the offline attribute therefore saves bandwidth between the KONNEKT client and SharePoint Online. The downside of this is, that no thumbnails or previews (e.g. of pictures) are rendered in Windows Explorer. Sometimes Windows Explorer also shows a grey X on files that are marked offline (see also Why is there a grey "X" on my files and folders?).
Disabling the offline attribute for some file types allows the Windows Explorer to show preview information for the files, at the cost of more network traffic and possible slower response times when browsing through directories.
Therefore, please disable the offline attribute with care and only for environments that have a good connection to Office 365.

Setting the Offline Attribute for all files

This policy controls if all files handeled by KONNEKT will be marked with an offline attribute.
GPO Policy Name: "Offline Attribute"
Key Name: EnableOfflineAttribute (REG_DWORD)
Values
GPO-setting
Value
Behavior
Not configured
N/A
All file-types (besides PDF) handeled by KONNEKT will be marked as offline.
Enable
(recommended)
1
All file-types (besides PDF) handeled by KONNEKT will be marked as offline.
Disabled
0
All file-types handeled by KONNEKT will be marked as online.

Exclude dedicated file-types from offline attribute (filter)

This policy is applicable to version 2.0 and above
This policy controls which file types will not be marked with an offline attribute.
GPO Policy Name: "Offline Attribute Filter"
Key Name: OfflineAttributeFilter (REG_SZ)
Values
GPO-setting
Value
Behavior
Not configured
N/A
Only PDF files are excluded from offline attribute.
Enable
<filetypes>
The specified file-extensions (separated by | ) are excluded from offline attribute.
Disabled
N/A
(Key not present)
Only PDF files are excluded from offline attribute.
Example for <filetypes>: pdf|png|jpg|jpeg

There are several ways to apply the policies

Policies stored in:
HKEY_CURRENT_USER\SOFTWARE\Policies\GlueckKanja\Konnekt
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\GlueckKanja\Konnekt