I will make a Procmon log.
the folder is a normal folder in a partition.
Can it interfere, that in an other partition exists a link to the problematic folder
made with mklink /J
But I have more of them, whereat Windows Search have no problems.
the mysterious key means "This PC" :
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\CLSID\{20D04FE0-3AEA-1069-A2D8-08002B30309D}]
@="This PC"
"InfoTip"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,\
6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,\
00,73,00,68,00,65,00,6c,00,6c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,\
2d,00,32,00,32,00,39,00,31,00,33,00,00,00
"LocalizedString"=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,\
6f,00,6f,00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,\
00,5c,00,73,00,68,00,65,00,6c,00,6c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,\
2c,00,2d,00,39,00,32,00,31,00,36,00,00,00
"System.PropList.DetailsPaneNullSelectTitle"="prop:System.Computer.SimpleName;*System.Computer.Description"
"System.Keywords"="@%windir%\\system32\\shell32.dll,-9012"
"System.PropList.DetailsPaneNullSelect"="prop:*System.Computer.DomainName;*System.Computer.Workgroup;*System.Computer.Processor;System.Computer.Memory"
... etc.