If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. docx and the signature (usually the first 3 characters in this file) PK. For example, Microsoft Word documents have the extension. Each file format has a unique extension and almost always a unique signature. If you know the file format, you can also find out how to open or edit the file. This file format is classified as Spreadsheet.

PlanPerfect, a discontinued iteration of WordPerfect saves a spreadsheet in a PLN file. WordPerfect is an office productivity software suite for word/spreadsheet processing, presentation, and database management. Just drag the file onto this browser window and drop it. You can also display a PLN file directly in the browser. Then click 'Open with' and choose an application. If you cannot open your PLN file correctly, try to right-click or long-press the file. Without proper software you will receive a Windows message ' How do you want to open this file?' or ' Windows cannot open this file' or a similar Mac/iPhone/Android alert. You need a suitable software like ArchiCAD to open a PLN file. A plugin used to extend the capabilities of InDesign desktop publishing software is saved in a PLN file. PLN is also the filename extension of an XML-encoded airplane description used by Flight Simulator amateur flight simulation program. A PLN file created with ArchiCAD version 17 and higher begins with ROF FDB file header while older versions begin with MM or WW header. Another type of PLN file is a 3D architectural design model created with ArchiCAD architectural design and building information modeling program. A PLN file is a 2D architectural drawing created with Home Plan building design software. PLN files mostly belong to ArchiCAD by Graphisoft.

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