That's an old version of the PSv format. the PSv format involves a lot of checking if (version > somenumber) { readbyte; } So yours might have to load a save like that, depending on the version number, but there might be more bytes depending on the version and / or element type.

PSv is almost impossible to load without just directly copying the c source, your going to have to look at that to figure out how to load it ):

I can give help on the current OPS format though, but not very much on the old, depreciated PSv format. I suggest you don't waste your time with PSv anyway, it's old and hasn't been used in a year.


Edit: oh, are you writing save files now? I don't know which version this is, try looking at the official game feedback and clicking some links, maybe you can figure out.

Edit2: maybe it's some version from https://powdertoy.co.uk/Download/Build.html?ID=85 to https://powdertoy.co.uk/Download/Build.html?ID=104 , those were all the builds in October 2011