.bld means Scratch 3D build. One of the earliest game files in scratch 3d, the earliest being build 0.1. I found it somewhere in the archives, and the build lasted until build 2 came out. Builds 1 to 14 are sadly for indev testers. Builds 15 to 20 are also exclusive to alpha testers and builds 21 to 24 are exclusive to beta testers. Build 25 is exclusive to gamma testers and build 26 is exclusive to delta testers.
