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TreeSize shows its formatted sizes in Mebi-, Gibi-, and Tebibyte, even though we are using the more "common" identifier Megabyte (MB), Gigabyte (GB), and Terabyte (TB) in the software. We decided to do it this way to prevent user confusion, because nowadays it is quite common to talk about e.g. Terabyte but actually meaning Tebibyte.

This can be achieved by creating a new entry in the "send to" context menu in windows:

1. Open the folder "%APPDATA%\Microsoft\Windows\SendTo".
2. Create a shortcut to your TreeSize.exe.
3. Open the properties of the new shortcut.
4. Under "Target" append the command line option "/OPEN".
5. Click "Ok".

In windows explorer, you can now right click on any XML file that you have previously exported to save your scan results and use "Send To" -> "TreeSize Professional".

Either no snapshots are existing or not all necessary services are running on the destination system.
You can verify the latter one as follows: right-click on the destination directory in Windows Explorer, open the properties page and select the "Previous Versions" tab. 
If no snapshots are listed there, TreeSize itself cannot display any entries. If you see entries there, not all services required for the comparison were running. 
These services have now been started implicitly by opening the "Previous Versions" dialog. If you execute "Compare with snapshot" again, you should see the correct results.

This is a common mistake when using the START command in batch files. The START command will interpret the first quoted string after the command as a title for the new command prompt instance. As the path to the TreeSize executable is quoted here, this will be the title for the cmd instance. Of course, the batch script won't work this way.

To be able to use quoted paths, you will have to pass a dummy title after the START command first. The following example script will work as expected:

FOR /F %%p IN (Paths.txt) DO START /WAIT "DummyTitle" "C:\Program Files\JAM Software\TreeSize Professional\TreeSize.exe" /EXCEL "report.xls" "%%p"

The NTFS deduplication segments files with fractionally equal content into so-called "chunks" which are moved into a the subfolder "System Volume Informaton\Dedup\ChunkStore\" (SVI) located on the corresponding NTFS partition. After the deduplication has been applied, the original files are replaced by a pointer to the corresponding chunk in the SVI directory. Two identical files will only require half of the disk space they occupied before after a NTFS deduplication. Since the original files now only contain a small pointer, the allocated disk space will be indicated by Windows with a much smaller value than before (for two identical files the occupied disk space would be indicated as "0 Byte"). To make TreeSize show the original file and folder sizes again, simply switch the view mode from "Allocated Space" to "Size". The allocated size shown in TreeSize is the disk space you would obtain by deleting the corresponding file