If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

How to Check the Contents of an ISO File. An ISO file is an exact image of an optical disc such as a CD, DVD or Blu-ray disc. Windows 7 provides limited native support for the format but it does ...

Open and check suspicious files Like programs, individual files can also be opened in an isolated sandbox. Sandboxie-Plus starts the default program for this file — for example Word for a DOCX file.

When you see the Photos can’t open this file because the format is unsupported or the file is corrupted, you can fix it in the following ways. Make sure the file format is supported Check if the ...

On Windows 10, you can use the System File Checker (SFC) tool to fix corrupted system files to fix system problems, and in this guide, we’ll show you how.

Learn how to use a Microsoft 365 setting to choose whether to open files in the online or desktop app, giving you full control for each file.