Custom tools plugin: Zip archive not being extracted on a windows slave

[Martin Hjelmqvist]

Developing a Rar extraction installer for extra-tool-installers-plugin and want to test extraction on connected slaves. But first I need to confirm that the connection and slave configuration has been done correctly by unpacking a zip file with the zip extractor in custom tools plugin, which is why I chose the user mailing list.

Both master and slave (name: SlavNod) have Windows OS. 
The slave's workspace is set to C:/Users/Martin/Desktop/Slave workspace/. 
Connection via Java Web Start (running slave-agent.jnlp). 
Zip extraction is working on master when slave is not connected, but when a slave is connected it creates a workspace folder and a project folder inside the workspace folder. However no extraction is being made.
Tried disabling the firewall, but no. Later tried with slave on same machine as master, but same result.

Checked Jenkins log, slave log and project console output, but no errors are found and the ZipExtractionInstaller says extraction was successful.

Console output:
Started by user anonymous
[CustomTools] - ZIP tool: Starting installation
[CustomTools] - ZIP tool: Tool is installed at C:\Program Files\Java\jre1.8.0_91
[CustomTools] - ZIP tool: Setting ZIP tool_HOME=C:\Program Files\Java\jre1.8.0_91
Building remotely on SlavNod in workspace C:\Users\Martin\Desktop\Slave workspace\workspace\ZIP
Finished: SUCCESS

What could be the problem?

[Martin Hjelmqvist]

Solved.
Misunderstood the meaning of 'Label' in Global Tool Configuration -> Custom tool installations and typed "test folder". This caused the problem. Read the description, left it blank and then it worked.