What is an appmanifest file?
An appmanifest file will tell us exactly whether Steam has correctly downloaded and installed Train Simulator, and each of the add-ons you own. The appmanifest file is not the same as a purchase receipt and cannot confirm you purchased an add-on. It can only tell us whether the add-on is installed properly, hasn't been disabled and whether any content, you should own, is missing.
Please Note the appmanifest file only includes anonymous information about your Train Simulator installation and does not include any information that can be used to identify you.
If your problem is relating to a missing add-on in your Game Library, you may also be asked to provide us with your original purchase receipt which are always provided by Steam when you make a purchase. Unfortunately, we do need the full receipt to prove it's valid and we cannot accept receipts which have been modified to remove any personal information.