CDR is proprietary to CorelDRAW
CDR is the native file format of CorelDRAW. Its internal structure is closed, so the reliable way to create a CDR is to open or import your artwork in CorelDRAW and save it there.
Need a CDR from a ICO? Here's why that isn't a direct conversion — and the editable formats that get you there.
You can't convert a ICO to CDR — CDR is CorelDRAW's own format, and only CorelDRAW writes it.
CDR is the native file format of CorelDRAW. Its internal structure is closed, so the reliable way to create a CDR is to open or import your artwork in CorelDRAW and save it there.
Even after importing, a ICO is pixels — not the editable shapes, text and layers a CDR is designed to hold. So a direct ICO → CDR conversion wouldn't give you a truly editable document anyway.
ICO is the Windows icon format for app icons and website favicons. It can hold several sizes in one file.
How to open ICO is used by Windows and browsers; icon editors can open and export it.
Full ICO format guideCDR is CorelDRAW’s native vector format for logos, layouts and print artwork — proprietary to Corel software.
How to open CDR opens in CorelDRAW; convert images to CDR to join a Corel workflow.
Full CDR format guide