I noticed the considerable contributions of Relfos (here) and thecocce (Lazarus forum) to the theme. Their approach requires to build a custom DLL (with Visual Studio) against the current Steamworks SDK, if I'm right. So every time the Steamworks SDK gets updated, someone has to update the custom DLL too, I guess. Perhaps you can stay with a certain SDK version over time. But if you don't have yet any SDK you have to download the current version and rely on an appropriate custom DLL.

Battlelogium is an open source Battlelog client that wraps Battlelog, Origin, and Battlefield 3 and 4 into one neat package. It enables Steam features such as the overlay and In-Home Streaming for both Battlefield 3 and 4. Battlelogium has existed for a while, however, version 2.0.0.0 brings with it a host of stability, performance and aesthetic improvements.
Because installing steam in a wrapper is a huge hassle, and you cannot run steam in cider. Don't despair here is a quick guide to ' How to run games bought on steam without steam ' Doing this is breaking the steam EULA, but usually we porters have to use SKIDROW cracks and all sorts of workarounds to play our own legally bought games.

Anyway the Steamworks API, although being a C++ construct, provides at least some simple C-functions for init and shut-down (steam_api.h). So in Pascal, after loading the steam_api.dll (win32), you can access those functions without any custom DLL:
I'm using this right now in my own game project. The Steam overlay is showing up and you even can access it. Further you can ensure that the Steam client is running. But all the other common Steam features are not available this way.

This class can be used to authenticate and get games of users of the Steam community site. It can access the Steam community site and authenticate a given user with his password. The class can also retrieve the list of games that a given authenticated user has for quick sale n eBay.

Then I stumbled upon the release notes regarding Steamworks SDK v1.32 (February 2015). One note reads as follows:

Added an auto-generated 'flat' C-style API for common Steamworks features (steam_api_flat.h).

At this point the exploration begins.

Windows Steam Games On Mac

I want to continue in an upcoming post. But feel free already to comment, to correct me or to give some advice regarding the possibilities of using that 'flat' C-style API.
Thanks!

Errors related to csteamworks.dll can arise for a few different different reasons. For instance, a faulty application, csteamworks.dll has been deleted or misplaced, corrupted by malicious software present on your PC or a damaged Windows registry.

The most commonly occurring error messages are:

The program can't start because csteamworks.dll is missing from your computer. Try reinstalling the program to fix this problem.
There was a problem starting csteamworks.dll. The specified module could not be found.
Error loading csteamworks.dll. The specified module could not be found.
The code execution cannot proceed because csteamworks.dll was not found. Reinstalling the program may fix this problem.
csteamworks.dll is either not designed to run on Windows or it contains an error. Try installing the program again using the original installation media or contact your system administrator or the software vender for support.

In the vast majority of cases, the solution is to properly reinstall csteamworks.dll on your PC, to the Windows system folder. Alternatively, some programs, notably PC games, require that the DLL file is placed in the game/application installation folder.

For detailed installation instructions, see our FAQ.

Windows Steam For Mac

Additional details about csteamworks.dll

CSteamworks.dll is a component in 'CSteamworks', a C ABI Wrapper for Valve's Steamworks API.

CSteamworks.dll is used by, for example:

World of Guns
Terraria

Download Steam Wrapper