The ornamental design for an architecturalfixture, as shown and described.
FIG. 1 is a perspective view of our new design for an architectural fixture;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left elevational view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a top plan view thereof.
The evenly dashed lines showing a square panel in the accompanying figures illustrate environment that forms no part of the claimed design. The remaining evenly dashed lines illustrate portions of the architectural fixture that form no part of the claimed design. The dash-dot-dash lines illustrate boundaries and form no part of the claimed design.