From my office PC I highlight a file, lets say an Excel .xls file. I right click the file and select rename. If I rename the file but neglect to include the .xls extension I get the following message in a Rename window:
"If you change a file name extension, the file may become unstable. Are you sure..."
At this point I have to click no and do the rename procedure again, this time including the .xls extension.
On my home PC this isn't the case. I can rename an Excel (or any other file type for that matter) and it keeps the original extension.
Both systems run XP. Why do they behave differently?