OT: What are the criterias for Windows VirtualStore?

[Tiemo Hollmann TB]

Hello,

I wonder, what are the criterias for Windows to virtualize files into the
virtualStore.

I had a program, which stores options in a xml file in
C:\ProgramData\myFolder. I could modify this option file without problems
with my program. Now I have a startup program, creating this xml file, doing
some stuff, calling my main program and exiting itself. When trying to
modify now the xml file with my main program, windows copies it into the
VirtualStore and does the changes over there.

My question is, what actually causes this behavior? Dows Windows really
knows, which file was created by which program and virtualizes the file, if
it is modified by another program, but allows changes by the program which
created the file, or is it something I am doing wrong?

Any Windows cracks over here? Thanks for any insights

Tiemo