# OPEN Command [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) → [O](Help%20System/GSTARCAD/2027/Commands/O/(O).md) ## Function Description: This command is used to open an existing drawing. The Select Files dialog box is displayed. Users can open or load a portion of a drawing, including specified geometrics in viewports or layers. In the Select Files dialog box, click the arrow next to the Open button and select Open Read-Only. If the FILEDIA system variable is set to 0, the OPEN command displays a command prompt without dialog box. Note: If the opened drawing contains macros, the Macros AntiVirus dialog box is displayed. GstarCAD 2023 supports the opening of ifc format and various third-party drawing files. ## Command Access: > **Icon:**  > **Menu:** File > Open > **Ribbon:** / > **Toolbar:** Standard > Open > **Command:** OPEN > **Alias:** / > **Shortcut:** CTRL+O **Command Prompts: /**  --- **Related References：** - [Commands about Opening Drawings (GstarCAD 2026)](../../../2026/Commands/00%20Command%20Groups/Commands%20about%20Opening%20Drawings.md) **Related Tasks：** - [To Open Drawings (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Open%20Drawings.md) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences_O/OPEN.html) · © Gstarsoft Co., Ltd.