How to play a file while it is recording?

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TV-Server Version: RC1
MediaPortal Version: RC1
MediaPortal Skin: Blue
Windows Version: XP SP2 with all updates
CPU Type: Quad core 6600
HDD: 1,2 TB
Memory: 2 GB
Motherboard:
Video Card: Geforce 8500 GT
Video Card Driver: Lastest
Sound Card: Realtek
Sound Card AC3:
Sound Card Driver:
1. TV Card: Hauppauge 4000
1. TV Card Type:
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec: PowerDVD 7.3
MPEG2 Audio Codec: FFdshow
h.264 Video Codec: Coreavc 1.6.5
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection:



Hi!
Thats simple. When i record tv program, i can see it on recording programs while it is recording. For this i haven't problem
But when i use another external program that it is recording in mpg file i can't play it from videos. Only when i stop this recording i can play.
I know that some months ago i get work with mpg files (just that i'm explaining here) but now i don't remember what i did.

if it's the same, but the external program is recording to a .ts format i can play. Why mpg not?

I think that maybe a codec problem. I follow the ffdshow manual and i have power DVD 7.3, coreavc 1.6.5 and Divx 6.8.2 installed and working.
Somebody have had this problem?

Thanks