LightmapSnapshot.asset detected as text by Perforce, but it's binary

Every time someone on my team bakes the lighting (realtime GI or baked) for their scene and checks in their files, Perforce incorrectly flags LightmapSnapshot.asset as a text file, and then other team members can't load it. This doesn't happen with other files, like the SkyProabe-0.exr, which is flagged as binary. Any idea how we can avoid having to redo the initial check-ins of LightmapSnapshot.asset by having it be detected as binary in the first place?

We are using visible meta files, and Asset Serialization Force Text

 

We also use Perforce with Asset Serialization set to Force Text. My LightmapSnapshot.asset got checked in as a binary file without me needing to do anything special. When I try to open it in a text editor, it's not human-readable like a prefab or scene file is. There must be a Perforce setting for this, but I'm not an administrator so I can't easily check.

 

Yes, this is due to Perforce (default) settings. Over a certain size (10MB by default) file type detection is disabled when a file is added, and it is added as text+C: http://www.perforce.com/perforce/r14.2/manuals/cmdref/p4_add.html