ok, try again:
file size: 137 MB (or 140,354 KB or 143,722,496 bytes)

status: This is an MPEG format video file. This format is not currently supported by GSpot. Note that "Rendering" may be used to obtain more information about an unsupported format.
To get more information by having GSpot instruct the O/S to "play" the file and then examine the results, press the button labeled "Render".
I did and I got: (S) --> MPEG-2 Demultiplexer --> InterVideo Audio Decoder --> (R)

also status: DirectShow claims to be able to play the file. The following combination of filters were used:
{C:\Users\Liliana\Desk..-..gspot221\VTS_01_2.VOB} (Audio Source)
{MPEG-2 Demultiplexer} (Audio Splitter)
{InterVideo Audio Decoder} (Audio Decoder)
{Default DirectSound Device} (Audio Renderer)

audio svc: is DOLBY_AC3

now it seems to me that this Gspot isn't going to help me with this file...
right?