Historically, .xcl files were used as for XTree for Windows , a classic file management utility from the MS-DOS and early Windows era.
2. Digital Preservation: eXtensible Characterisation Language
While "XCL_0.16c.zip" is not associated with a single, universally recognized major software release, the file extension and "XCL" acronym are commonly found in several niche technical and legacy computing domains.
Version "0.16c" would suggest a beta or early-stage development build of a firmware project.
