#7 frequent recourse to the file shdocvw.dll

[Anonymous]

recently, with the help of the program filemon found that the explorer.exe process several times a second produces a reading of the file shdocvw.dll. Also, after uninstalling foldersize file access is terminated, in particular, after the removal of key
HKEY_LOCAL_MACHINE \ SOFTWARE \ Classes \ Folder \ shellex \ ColumnHandlers \ (04DAAD08-70EF-450E-834A-DCFAF9B48748)
What would it be and whether it reduces the performance of the system?