PartitionGuru provides this function "Delete Files Directly" which can skip file system driver and delete files by writing disk directly. It can delete files of partitions except the system partition. This function can delete files that can not be deleted in normal way.
First select a file you want to delete in the file list; right click the selected file and on the popup menu select "Delete Files Directly" as shown below; also you can achieve the function by selecting menu items "File"→ "Delete Files Directly".
Select the item "Delete Files Directly" and PartitionGuru will lock the partition where the file is saved. To prevent data loss, please exit all programs using the partition and close all files of this partition. After the deletion, the partition can be used normally again.