Excel File Reservation Read Only Problem

hi all, i'm getting prompt when trying open excel files on local hard drive says "file reservation, file name being modified user. open read-only, or choose notify alerted when available." see image below.



folder files reside being shared computer. have tried restarting both computers , leaving other computer off, message still comes up. made sure have read/write permissions , tried repairing permissions disk utility didn't work. tried making copy of file, , copy had same issues.

suggestions? in advance!

 

did open read , save under different name?

try save earlier excel format.

 

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