Query to find the Database Name and File Size/Space Info

SELECT
a.FILEID,
CONVERT(decimal(12,2),ROUND(a.size/128.000,2)) as [FILESIZEINMB] ,
CONVERT(decimal(12,2),ROUND(fileproperty(a.name,'SpaceUsed')/128.000,2)) as [SPACEUSEDINMB],
CONVERT(decimal(12,2),ROUND((a.size-fileproperty(a.name,'SpaceUsed'))/128.000,2)) as [FREESPACEINMB],
a.name as [DATABASENAME],
a.FILENAME as [FILENAME]
FROM
dbo.sysfiles a