*.scr files cannot be edited/modified on network location

We use PDMS Modelling package in our organisation. It generates scripts files with *.scr extension. These *.scr extensions needs to be modified from a shared drive (network-LAN).
On the server where they exists we can edit, modify, delete, amend, do every thing. But on a share level “only for this *.scr extension” we cannot do anything but delete or read. Or even cannot create a new *.scr file. All other extensions work fine.
I excluded *.scr extension from my antivirus program as well but it didn’t help either.
My assumption is if they are locked by windows to be used as screen saver file. I might be wrong. All file permissions etc are perfectly in place.
As a test I also used an XP machine and tried to edit any *.scr file from a network location and it came up with a message showing file(s) may be locked etc.
Is there anyway I can work on the *.scr file extension so that files can be edited on network.