An SMRD file contains filter information used by InDesign, a desktop publishing design application. It stores information required to import text and graphics from another file format. SMRD files are used for filtering text and images from other programs to the InDesign format.
SMRD files are actually folders containing a collection of files. To browse the files, remove the ".smrd" extension and open the folder. The InDesign installation includes several SMRD files, which are located in the /Plug-ins/Filters/sangam readers/ directory.
NOTE: SMRD files are similar to .SMWT files, which are used for exporting text and graphics. The "RD" in SMRD stands for "reader," while the "WT" in SMWT stands for "writer."