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Excel file opening in Read Only Mode I had this problem today, and finally figured out the solution. I had put a slash '/' in the filename, which is OK on the Mac, but Excel does NOT like it. When I removed the slash from the filename (using the finder), the Excel file then opened normally.

I often use slashes when adding the date as part of the filename. When working on an Excel, Word, or PowerPoint file, I have to remember to use dashes, not slashes. In this case, my filename included the phrase '64/128 bit register'. I changed it to '64 or 128 bit register'.

Hope this helps someone. I wasted a lot of time on it. MacBook Pro (Early 2011) running OS 10.8 Mountain Lion Office for Mac 2011 vers 14.2.3 (120616). Take out slash in file name worked for me Worked for me, thanks! Had put a slash '/' in the filename, which is OK on the Mac, but Excel does NOT like it. When I removed the slash from the filename (using the finder), the Excel file then opened normally.

I often use slashes when adding the date as part of the filename. When working on an Excel, Word, or PowerPoint file, I have to remember to use dashes, not slashes.

In this case, my filename included the phrase '64/128 bit register'. I changed it to '64 or 128 bit register'.

Click to expand._______________________________________________ hi there well i have been having this issues with some of the users getting this read only problem. So here it goes, microsoft needs to improve there coding!!

In my case and i say this it might not work for all of you, (well i hope it does) the users always were using the slash ie, myfile_from_.xlsx. Wd my passport for mac software. The solution that worked for me was to remove the slash and put a dash. Now when they open it, it is no longer read only. I really hope this helps!, its people like you and me that make the problem solving a bit easier! So as someone once said. THINK DIFFERENT!

Not the solution I think this solution must be an accidental solve (i.e not the real fix) I've had this problem with a few files which now cannot be accessed from another machine because it thinks someone else is currently modifying it. I've removed all non alphabet characters (/ - _ ) and the problem remains. 10.6.8 machine trying to access a.xls file stored on a 10.8.2 iMac. I've checked permissions are ok. Only workround is to save as a new file on the client machine, but as it's a file a number of us work on it's not a viable solution. I had this problem today, and finally figured out the solution.

I had put a slash '/' in the filename, which is OK on the Mac, but Excel does NOT like it. When I removed the slash from the filename (using the finder), the Excel file then opened normally.

I often use slashes when adding the date as part of the filename. When working on an Excel, Word, or PowerPoint file, I have to remember to use dashes, not slashes. In this case, my filename included the phrase '64/128 bit register'. I changed it to '64 or 128 bit register'.

Hope this helps someone. I wasted a lot of time on it. MacBook Pro (Early 2011) running OS 10.8 Mountain Lion Office for Mac 2011 vers 14.2.3 (120616). Elusive fix Mac only computers. Problem same as descriptions above, occurs on files transferred between work and home on a USB stick formatted for PCs when bought, reformatted for Mac with Disk Utility. No problem for years, hundreds of files with NAMEdd-mm-yy.xlsx name format, then recently one out of 10 or 20 will say it it's Read Only when opened at the location away from where it was created. Changing status with Info window has no effect.