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You may be getting this error when trying to start a steam:// URL because of a faulty registry. This problem may occur if you transfer Steam to a different drive/directory.

Possible solutions

1. To repair it, you should change the value of HKEY_CLASSES_ROOT\steam\Shell\Open\Command so it matches to that of the new drive/directory.

Example

If your old Steam directory was C:\games\Steam, then the value of the key should look like this:

"C:\games\Steam\steam.exe" "%1".

Then, if you moved Steam to D:\games\Steam. The new key value should be changed to reflect the transfer:

"D:\games\Steam\steam.exe" "%1". 2. Another solution for this problem, for those of you who don't want to mess with the registry is to re-run the Steam Installer and specify the new directory you will be using for Steam when completing the installation process.