Particles sometimes do these things. I do not know why. To creating a new particle, adjust some settings then test wheter it works or not after each change.
Forgive me, I don't quite understand your question since my original language isn't English, but I guess your question is "when it crashes", right? If I'm right, it crashes when I place the system of particles in the Level Editor. I can open the file in the Particle Editor, but when I try to put it in the Level Editor, it crashes. I hope you understand.
The level editor and the game handles particle systems differently than the particle editor. You could probably gain some insight on the issue by looking at the LevelEditor.log located at Documents/HPL2/.
Initializing Graphics Module
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Setting video mode: 1024 x 768 - 32 bpp
Init Glew...OK
Setting up OpenGL
Vendor: ATI Technologies Inc.
Renderer: AMD Radeon HD 6320 Graphics
Version: 4.1.10825 Compatibility Profile Context
Max texture image units: 16
Max texture coord units: 16
Max user clip planes: 8
Two sided stencil: 1
Vertex Buffer Object: 1
Anisotropic filtering: 1
Max Anisotropic degree: 16
Multisampling: 1
Texture compression: 1
Texture compression S3TC: 1
Auto generate MipMaps: 1
Render to texture: 1
Max draw buffers: 8
Max color render targets: 8
Packed depth-stencil: 1
Texture float: 1
GLSL Version: 4.10
ShaderModel 2: 1
ShaderModel 3: 1
ShaderModel 4: 1
OGL ATIFragmentShader: 1
Adding engine materials
Initializing DevIL
Vendor String: Abysmal Software
Version String: Developer's Image Library (DevIL) 1.6.8pre Aug 12 2006
Version Number: 168
Adding engine post effects
--------------------------------------------------------
Initializing Sound Module
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Initializing OpenAL
Available OpenAL devices:
0. Generic Software on Speakers (Realtek High Definition Audio)(OpenAL default)
Trying to open device 'Generic Software on Speakers (Realtek High Definition Audio)'... Success!
Number of mono sources: 32
Streaming setup: 2 Buffers x 524288 bytes each
--------------------------------------------------------
Game Running
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ERROR: Couldn't find particle system file '.ps'
ERROR: Couldn't create particle system 'ParticleSystem_1' of type ''
ERROR: Couldn't find particle system file '.ps'
ERROR: Couldn't create particle system 'ParticleSystem_1' of type ''
ERROR: Couldn't find particle system file '.ps'
ERROR: Couldn't create particle system 'ParticleSystem_1' of type ''
ERROR: Couldn't find particle system file '.ps'
ERROR: Couldn't create particle system 'ParticleSystem_1' of type ''
ERROR: Couldn't find particle system file '.ps'
ERROR: Couldn't create particle system 'ParticleSystem_1' of type ''
But, you know, leave it, it's just a particle system, I can make the game without it.