Andrew,

Not OS or Version depending.

We can't filter on some specific properties of polylines.

Handy would be:
- Global Width
- Orientation

Specific:
- Polyline Pattern
But I don't really search for them ... For some post-op I just need them all to be set to 'No'.
- # of vertices
Filtering the complex from the more simple ones.
- Including Bulges or not
To seperate polylines with arc segments form others.
There some operations that don't really work with bulging.
- Z values and/or global Z
This would make sense for some but filtering on Z is not common under QCAD as it is 2D.

Regards,
CVH