Why several system processes can access a file at the same time in Win10?

[hpxwj]

[#2]

How can I check which process access this file actually?

[#3]

Hello @hpxwj,

When a process access a file, it ask the OS to lock for it. 

Often, the processes does not ask for an exclusive lock and multiple processes can access the files at the sames time. 
https://en.wikipedia.org/wiki/File_locking#In_Microsoft_Windows

For example, one process can lock a file for write, while allowing any other process to read the file.

[#4]

Hello,Kuinox,
How can I check which process access this file actually?

[#5 · Accepted solution]

@hpxwj 

Check this StackOverflow post: https://stackoverflow.com/questions/13420057/view-open-file-handlers-for-a-process-on-windows