Knowledge Base


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I want to search for duplicate files on a SharePoint site. I know there are duplicate Office files, but TreeSize doesn't show them.

Other file types are being found as expected.

When uploading an Office file to SharePoint, the SharePoint itself alters the file. As such, they differ binary and can no longer be considered duplicates when comparing their MD5 checksums.
This can be verified by uploading a file twice, download both files again and compare their binary values and/or checksums. Other file formats (e.g. PDF, PNG, ..) are - by default - not being altered by SharePoint and work as expected.

Is it possible to exclude subfolders in the file search?

Yes, that is possible. Under "Custom search > Other Filters", you can change the search parameters to include only folders of a certain directory level. You can exclude subfolders by selecting a "Maximum directory level" = 1, relative to the search path.

Why can I not see any network drives within TreeSize?

Since Windows Vista and later, Microsoft enforces more strict security rules on the operating system. One side effect of this is that you may not see your mapped network drives anymore (Windows 8 and later), or they appear disconnected (typically in Windows Vista and 7) in allapplicationsthat run with administrator privileges. This is because Windows uses different user environments for non-elevated and elevated processes. There are some workarounds to gain access to those network drives anyway:

  • Do not run TreeSize as administrator unless it is truly needed.
  • Manually enter the UNC path (e.g. "\\server\share") for the network drive into the path drop-down list and press enter.
  • Use the "Map network drive" or "Add drive or UNC path" dialog from the Drive List menu bar.
  • [Not recommended because of security bypasses!] Enable "Linked Connections" as described here.

Is there a way to export a full detail report down to the item level with using TreeSize Professional?

Yes. To get a full report in Excel  in TreeSize Professional, you need to check-mark the option "Tools > Options > Export > Excel > Export the full directory branch" and "Include single files in export". Then choose "File > Export > Excel File".

TreeSize takes a long time to start when it is virtualized using App-V. What is the reason for this?

Our 3rd party library which manages our installation keys iterates the registry key HKEY_LOCAL_MACHINE\CLSID which takes magnitudes longer under App-V virtualization than on a normal system. A possible solution is described here: We will replace the library that handles the installation in keys in TreeSize V8.0 so that this iteration will no longer take place.

How are the High and Low attributes in the XML reports equated to the LastChangeDate and LastAccessDate of the folder?

They are used equally to the Windows FILETIME structure, follow the link for details.

I've noticed that the "Last Access" date is not updated, it is much older than the "Last change" date. What is the reason for this?

The last access date of a file is maintained by Windows. Since Windows Vista/Server 2008, Microsoft disabled the automatic update for the "Last access" date by default to improve system performance on NTFS formatteddrives. Because of this, the date won't be updated anymore if a file content is changed for example. That is also the reason why the last access date isn't a good indicator anymore for recent usage of a file. For more information on these topics, please refer to the following MSDN articles:

I get a Certificate Error on start. How do I fix this?

Treesize.exe is digitally signed using an AuthentiCode certificate issued by GlobalSign. One possible cause for this error is that the GlobalSign root certificate is missing, so the certificate chain is broken. The GlobalSign root certificates are deployed through Windows updates and during the installation of TreeSize. There are only two possible resolutions if you want to use our products on that system:

  • Install the product using our installer, or
  • please make sure all available Windows updates are installed on this system.
In the unlikely case both options did not resolve the option, please point a Windows Explorer to “C:\Windows\JAM Software\TreeSize\”, right click on TreeSize.exe, select “Properties”, go to the tab “Digital Signatures”, select the item “sha256”, then press the “Details” button, then press the button “View Certificate”. Please send us a screenshot of the tab “Certification Path” of the dialog window which pops up then and a screenshot of the actual error dialog.

TreeSize does not follow symbolic links pointing to another drive and in our DFS tree, it shows 0 KB for these links. Can this be changed?

You can change the behavior by check-marking the option "Tools > Options > Scan > General > Follow Mountpoints and external symbolic links". Symbolic links are marked by Treesize with a small arrow on the folder icon.

How can I see the file that has increased the space in the right hand window of a compare. Currently it only shows the folders and in the left hand window says FILE but when I click on the folder in the left hand window it does not list the files in the right hand window.

TreeSize stores data only on folder level, otherwise the mount of data would be too large.This is why it can 't display the the size increase of files. We also offer another disk space manager called SpaceObServer which is designed for large servers and continuous reporting. It regularly collects the file system information using a background agent and stores it in a SQL database, including size development. It uses less RAM than TreeSize Pro and the reporting capabilities are faster and more flexible because it is built on a database and collects data on file level. SpaceObServer offers advanced scripting capabilities through OLE Automation. If you are interested, please visit:

is there a way to deduplicate files. for example when i move duplicate files to new location, only one copy will be generated inthe new location and links to this copy will be in the original locations.

This can be done with the search type "Duplicate Files" of the TreeSize File Search. It allows to replace all duplicate files by a hardlinks to single file using the option "Deduplicate". Please check the help file on more details on deduplication.

How can I have the same view like in "Top 100 files" view for more then 100 files?

You can increase the number of files that are included in this statistic under "Options > Top Files > Show the top X files". You can also use the seach type "Biggest Files" of the TreeSize File Search. The results can be exported in different ways as well.