The string you mentioned refers to the 1995 Bollywood classic Dilwale Dulhania Le Jayenge

"720p"

(DDLJ). While the specific phrasing is typical of unofficial file names—where is the resolution, "x264" is the video encoder, and "syedl" is likely the name of the individual or group who shared the file—you can access high-quality, official versions of this film through several legitimate platforms. Where to Watch Officially