It sounds like others are having similar issues as I do a browse on the web. Although I've never used "offline" files, here are some suggestions that I can think of:
Take Ownership/Change Access Rights:
- Copy the files to a another folder on your computer.
- Take ownership of the files, and change the "attributes" to not be read-only (right click on the file(s) and make sure the box "ready-only" is unchecked)
You might only need to change the attributes of the files but just in case I included taking ownership
Use something other than "offline" files:
Ya microsoft does have some "cool" features but in reality they are "ok" at best. I would highly suggest using a third party software to synchronize files. Some suggestions that I use regularly are:
DropBox: A simple program that is free for a small amount of storage space. You can get more space by inviting other friends. (I've also heard that sending in error report can increase the size) You can also purchase and increase of space as well. The great thing about dropbox is you can install it on as many PC's, MAC's, Linux's and even Mobiles as you want. There is an online copy stored as well. Sharing files/folders with others is a breeze as well.
Syncplicity: You might also consider using Syncplicity a pretty competitive alternative to dropbox. (I actually use both) Similar to dropbox, syncplicity has free options, and the paid increased space options. Files are available online, and you can install on as many PC's and MAC's as you want. A unique thing about syncplicity is that you can link your syncplicity folders to your google docs. Finally with the "buisiness" option you can it with file servers as well. (I have not tried/tested this)
These options (unless syncplicity does work with file servers) may not suit your needs if the network share is a server. However if it's a workstation that you or a co-worker are sharing with each other, these may be alternatives for you.