Step 4 Saving repaired Excel file to a destination location.. anywhere in the file path (and not just in the file name) will cause Word to fail to open the file. â macycron Aug 29 '12 at 18:57. 10 MB is the size limit for files that you can open from the UNC share. On the File tab, select Open > Browse to locate the damaged file. "Excel cannot open the file 'filename.xlsx' because the file format or file extension is not valid. Step 3 Previewing the repaired files selected from the left bar.. document. 1. > > > *Use the File Open dialog box to locate the document." If not, then change the extension of the file. The Windows FAT and NTFS file systems are not limited to 8.3 file names, because they have long file name support, but they still support the 8.3 version of long file names. Some filesystems restrict the length of filenames. Do not hyphenate." Why not just rename the file to not have a comma in it? Step 2 In the searched result section display all corrupt Excel file, select one or all start to repairing process. The original form of the word was "file name" and "filename" became popular as more people and software programs began to use that version of the word. There is also no issue with attachments in outlook, just embedded images. Get the answers! Exporting .doc as .pdf Not A Valid File Name: User Name: Remember Me? going into word and file, open does not work either.