If you want to update a single file in your game, you need to do all of the following:
1. Export the project again from C2
2. Upload the file you want to update *and* offline.appcache (with that name - note you spelt it wrong in your post, just pointing it out in case it is the source of the problem)
3. Once uploaded, load the game again, wait a minute or two, then close and reopen the game again. You have to load it twice - the first time it notices the update is there and downloads it, but plays the old version in the mean time. The second time it loads the update.
Are you sure you've done all that? More information in the offline games in C2