Failed to load save game. The file is corrupted.

[AndrewT]

How do you "manually uncompress" a "corrupted" save game file?

Here's what worked for me in Windows:

Click on the save game file name and hit f2 to rename. Add .zip to the end of the filename, or replace .eu4 with .zip .

Right-click on the new filename, and choose "Extract All" from the options there. In the "destinations" dialog that comes up it will show something like:
...\Documents\Paradox Interactive\Europa Universalis IV\save games\Ottomans1444_11_11

Delete just the filename (eg Ottomans1444_11_11) at the end (OR: use the Browse button there to select the EU4/Save Games/ folder), then hit the Extract button. You'll get the proper save file now, plus a small file called "meta" which you can delete.

 

[fishmanbr]

This thread saved my life: http://forum.paradoxplaza.com/forum/showthread.php?819128-Cloud-save-files-strikes-again....
The base is the same as the post above this (from AndrewT), but explains where the cloud file is...

 

[gentz]

Just wanted to report that I have the same problem with the ironman mode.

I started an ironman game with Muskovy. It went really well. Now, when I try to load the savegame, EU IV just crashes to the desktop. I tried the solution under the above link - unfortunately it's not working for me.

In another try with Muskovy, the game stopped being ironman. With this I am still able to load it, but I can't obtain steam achievements anymore.