Have you mapped the server to a drive letter? Often that helps with some software. (Never seen this issue with AC.) Cannot tell from your screenshot how you actually browsed to that remote folder and what the full path to that file would look like.
Follow the directions here:
http://technet.microsoft.com/en-us/magazine/ff678296.aspx
to get the full path and paste it in a message here.
Because a local copy works fine, it seems that it is likely either an issue with the path or with the permissions for the folder/file.
Also... to confirm... you definitely have read/write access to the folder/directory that you show in your screenshot? You can right click and create a new file there and also delete it?
PS Personally, I've found it a nightmare trying to get Window 7 and XP to share files. It's possible that the issue is something related to how that was done in your office and whoever got it working might have to help resolve this.
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB