Do not take this as being condecending but the point that Ruth was ttrying to make was:
I just checked a Sample Database from UFT and these are the files associated with that database:
In addition to the *.PRO file, which Ruth seems to think is the only file you have backed up according to your post, this sample project has 14 *.CDX files, 14 *.DBF files, 13 *.FPT file and 1 *.ICP file. Also associated with the project are the library files which can include 3 files each, *.CDX, *.DBF and *.FPT, of the following types: ELBOOK, CHBOOK, ELREF, LIBOOK, PLBOOK, ROBOOK, ROREF, SOBOOK, STBOOK AND STREF.
If you do a backup, and include the library files ALL of the data in these 73 files would be included in the backup. The *.PRO is only one of these 73 files with almost all of the data except the project name being stored in the other 72 files.
Now about your problem, is there any way you can access the original computer which has all of these file or do you have a previous *.sqz backup file which you may have made in the recent past?
If not there is almost no way that I know of to restore your data.