How to open a BSP file in hammer?

I saved a map into a bsp file, and now I cant find the original map file. I tried to convert the file extension, it just got to 5% then froze, and crashed. Is there any way to import a BSP file into hammer?

Use BSPSource to decompile your BSP file back into a VMF. Be aware some things in your map may break as decompiling isn’t exactly 100% accurate or reliable.

If you still have the .vmx just rename the extension .vmf

Thanks, that seemed to work.