The installation for Plant 3D / P&ID places all of the project specific files in a separate folder. Right now they are in the root of the project folder and some are in other subfolders. This requires identification of all of the individual files and changing their NTFS permissions individually.
If they were all placed in a subfolder (e.g.“Project Setup”) then it would be extremely easy for IT to lock out all end users except whoever should be altering these files. That would protect against changes made through Project Setup or by editing or trying to delete these .XML, .DCF, .projSymbolStyles.dwg and other miscellaneous project setup files.