Excel files may fail to open due to corruption, incorrect extensions, or other programs. Dynamic Data Exchange (DDE) settings can prevent Excel from opening files. Incorrect file associations can prevent Excel from opening
Download files locally before opening from SharePoint. Click "Open in Excel" button in error popup. Microsoft security message prompts for local download confirmation. Enter SharePoint access credentials if file is protected
Excel must open .xlsx, .xlsm, or .csv files through MS Excel. File extension must be correct (.xlsx or .xlsm). Security risk alerts can be unblocked in file properties
Unsupported file type is the most common reason for PDF opening issues. Outdated Adobe Reader or Acrobat programs can prevent PDF opening. Damaged PDF files may occur during creation or email transmission. Corrupted Adobe Reader installation can cause PDF opening problems. PDF files may be infected with viruses
Limited file permissions can prevent access to OneDrive files. Too much cached data may cause file loading problems. Incorrect file access settings can block file access. Internal program issues may prevent file opening
Restarting the PC helps resolve minor bugs and errors. Windows Update Troubleshooter automatically scans and fixes issues